refactor: Enhance docs, code, add tests in Median

[Hardvan]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• 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.
✅ Project coverage is 77.22%. Comparing base (bc7b656) to head (f65c326).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6751      +/-   ##
============================================
+ Coverage     77.21%   77.22%   +0.01%     
- Complexity     6141     6142       +1     
============================================
  Files           720      720              
  Lines         20525    20527       +2     
  Branches       3973     3973              
============================================
+ Hits          15848    15853       +5     
+ Misses         4069     4068       -1     
+ Partials        608      606       -2     

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[alxkm]

Looks good. Thank you for the contribution.