Call urlparse less frequently

[mbrunthaler]

Currently, urlparse is invoked for all properties of uri in vcr.request.Request which has an impact on performance especially with lengthy cassettes. I've changed this to use a property such that urlparse is only invoked when uri is changed.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.29%. Comparing base (c3767c2) to head (00f2982).
Report is 282 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #609      +/-   ##
==========================================
+ Coverage   89.85%   92.29%   +2.44%     
==========================================
  Files          27       27              
  Lines        1734     1844     +110     
  Branches      285      245      -40     
==========================================
+ Hits         1558     1702     +144     
+ Misses        140       95      -45     
- Partials       36       47      +11     

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