feat: Add `OptimalFileMerging` 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 69.43%. Comparing base (3a30e48) to head (16e5119).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5805      +/-   ##
============================================
+ Coverage     69.41%   69.43%   +0.02%     
- Complexity     4685     4688       +3     
============================================
  Files           624      625       +1     
  Lines         17143    17155      +12     
  Branches       3305     3307       +2     
============================================
+ Hits          11899    11911      +12     
  Misses         4789     4789              
  Partials        455      455              

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