feat: Add `ProportionalFairScheduling` new algorithm with Junit tests

[Hardvan]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.74%. Comparing base (7a539bc) to head (2115454). Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5812      +/-   ##
============================================
+ Coverage     69.70%   69.74%   +0.03%     
- Complexity     4714     4719       +5     
============================================
  Files           629      630       +1     
  Lines         17211    17231      +20     
  Branches       3317     3319       +2     
============================================
+ Hits          11997    12017      +20     
  Misses         4758     4758              
  Partials        456      456              

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