Add support for multiple GCS file system instances

[majetideepak]

Description

Currently only one is supported
https://github.com/facebookincubator/velox/blob/main/velox/connectors/hive/storage_adapters/gcs/RegisterGcsFileSystem.cpp

[majetideepak]

@JkSelf will you be able to help with this?

[JkSelf]

@majetideepak Yes. I will follow up this issue. Thanks.

[JkSelf]

@majetideepak I successfully compiled the GCS test in my local environment using the following command:
make release NUM_THREADS=110 MAX_HIGH_MEM_JOBS=110 MAX_LINK_JOBS=110 'EXTRA_CMAKE_FLAGS=-DCMAKE_CXX_FLAGS="-Wno-missing-field-initializers" -DVELOX_ENABLE_PARQUET=ON -DVELOX_BUILD_TESTING=ON -DVELOX_MONO_LIBRARY=ON -DVELOX_BUILD_RUNNER=OFF -DVELOX_ENABLE_GCS=ON -DCMAKE_BUILD_TYPE=Release'

However, I encountered an issue when running the unit test. The following exception was thrown:

root@sr249:/home/lab01/velox# ./_build/release/velox/connectors/hive/storage_adapters/gcs/tests/velox_gcsfile_test --gtest_filter=GcsFileSystemTest.readFile
Running main() from /mnt/DP_disk1/code/gluten/ep/build-velox/build/velox_ep/_build/release/_deps/gtest-src/googletest/src/gtest_main.cc
Note: Google Test filter = GcsFileSystemTest.readFile
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from GcsFileSystemTest
[ RUN      ] GcsFileSystemTest.readFile
/home/lab01/velox/./velox/connectors/hive/storage_adapters/gcs/tests/GcsEmulator.h:125: Failure
Value of: bucket.ok()
  Actual: false
Expected: true
Failed to create bucket <test1-gcs>, status=PERMISSION_DENIED: Permanent error, with a last message of <!-- IE friendly error message walkround.
     if error message from server is less than
     512 bytes IE v5+ will use its own error
     message instead of the one returned by
     server.                                 -->

Do you have any suggestions on how to resolve this issue? Thanks.