Refactor files

[2bndy5]

This is intended to allow calling both rust lib and python lib "cpp-linter" when installing with cargo or pip.

Also when using python, the entry point script is now the same as it is in v1.x: cpp_linter.main().

I also decided to split up the 1000 lines of code in src/rest_api/github_api.rs (into 3 files). This should make much easier to add support for other REST API clients.

[codecov]

Codecov Report

Attention: Patch coverage is 97.95022% with 14 lines in your changes missing coverage. Please review.

Project coverage is 98.50%. Comparing base (9189e86) to head (7da7084).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cpp-linter/src/rest_api/github/mod.rs	97.74%	7 Missing ⚠️
cpp-linter/src/rest_api/github/specific_api.rs	98.02%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   98.50%   98.50%           
=======================================
  Files          12       14    +2     
  Lines        3144     3144           
=======================================
  Hits         3097     3097           
  Misses         47       47           

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