fix: results of pip show are not properly parsed

[xieshenzh]

Description

Splitting pip show results with --- could generate incorrect results when a package contains license information.
An example of such package can be generated by executing pip3 show scipy.

Code in this PR reads the results of pip show line by line, and groups information by packages.

Jira: https://issues.redhat.com/browse/TC-644

Checklist

• I have followed this repository's contributing guidelines.
• I will adhere to the project's code of conduct.

Additional information

Anything else?

[xieshenzh]

Example package information that cannot be parsed correctly by splitting by ---:

Name: scipy
Version: 1.11.3
Summary: Fundamental algorithms for scientific computing in Python
Home-page: https://scipy.org/
Author: 
Author-email: 
License: Copyright (c) 2001-2002 Enthought, Inc. 2003-2023, SciPy Developers.
        All rights reserved.
        
        Redistribution and use in source and binary forms, with or without
        modification, are permitted provided that the following conditions
        are met:
        
        1. Redistributions of source code must retain the above copyright
           notice, this list of conditions and the following disclaimer.
        
        2. Redistributions in binary form must reproduce the above
           copyright notice, this list of conditions and the following
           disclaimer in the documentation and/or other materials provided
           with the distribution.
        
        3. Neither the name of the copyright holder nor the names of its
           contributors may be used to endorse or promote products derived
           from this software without specific prior written permission.
        
        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
        "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
        LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
        A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
        OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
        SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
        LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
        OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        
        ----
        
        This binary distribution of SciPy also bundles the following software:
        
        
        Name: OpenBLAS
        Files: scipy/.dylibs/libopenblas*.so
        Description: bundled as a dynamically linked library
        Availability: https://github.com/OpenMathLib/OpenBLAS/
        License: BSD-3-Clause-Attribution
          Copyright (c) 2011-2014, The OpenBLAS Project
          All rights reserved.
        
          Redistribution and use in source and binary forms, with or without
          modification, are permitted provided that the following conditions are
          met:
        
             1. Redistributions of source code must retain the above copyright
                notice, this list of conditions and the following disclaimer.
        
             2. Redistributions in binary form must reproduce the above copyright
                notice, this list of conditions and the following disclaimer in
                the documentation and/or other materials provided with the
                distribution.
             3. Neither the name of the OpenBLAS project nor the names of
                its contributors may be used to endorse or promote products
                derived from this software without specific prior written
                permission.
        
          THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
          AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
          IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
          ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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          CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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          USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        
        
        Name: LAPACK
        Files: scipy/.dylibs/libopenblas*.so
        Description: bundled in OpenBLAS
        Availability: https://github.com/OpenMathLib/OpenBLAS/
        License: BSD-3-Clause-Attribution
          Copyright (c) 1992-2013 The University of Tennessee and The University
                                  of Tennessee Research Foundation.  All rights
                                  reserved.
          Copyright (c) 2000-2013 The University of California Berkeley. All
                                  rights reserved.
          Copyright (c) 2006-2013 The University of Colorado Denver.  All rights
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        Files: scipy/.dylibs/libgfortran*, scipy/.dylibs/libgcc*
        Description: dynamically linked to files compiled with gcc
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        License: GPL-3.0-with-GCC-exception
          Copyright (C) 2002-2017 Free Software Foundation, Inc.
          
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          a copy of the GCC Runtime Library Exception along with this program;
          see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
          <http://www.gnu.org/licenses/>.
        
        ----
        
        Full text of license texts referred to above follows (that they are
        listed below does not necessarily imply the conditions apply to the
        present binary release):
        
        ----
        
        GCC RUNTIME LIBRARY EXCEPTION
        
        Version 3.1, 31 March 2009
        
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        ----
        
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        Name: libquadmath
        Files: scipy/.dylibs/libquadmath*.so
        Description: dynamically linked to files compiled with gcc
        Availability: https://gcc.gnu.org/git/?p=gcc.git;a=tree;f=libquadmath
        License: LGPL-2.1-or-later
        
            GCC Quad-Precision Math Library
            Copyright (C) 2010-2019 Free Software Foundation, Inc.
            Written by Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
        
            This file is part of the libquadmath library.
            Libquadmath is free software; you can redistribute it and/or
            modify it under the terms of the GNU Library General Public
            License as published by the Free Software Foundation; either
            version 2.1 of the License, or (at your option) any later version.
        
            Libquadmath is distributed in the hope that it will be useful,
            but WITHOUT ANY WARRANTY; without even the implied warranty of
            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
            Lesser General Public License for more details.
            https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
Location: /Users/xiezhang/Library/Python/3.9/lib/python/site-packages
Requires: numpy
Required-by: gensim

[zvigrinberg]

@xieshenzh good catch!
lgtm, Approved.
You can merge whenever you want