feat: Add KthElementFinder new algorithm with Junit tests

[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 70.32%. Comparing base (cdf509f) to head (c5d3e38).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5836   +/-   ##
=========================================
  Coverage     70.31%   70.32%           
- Complexity     4769     4772    +3     
=========================================
  Files           637      638    +1     
  Lines         17313    17325   +12     
  Branches       3331     3335    +4     
=========================================
+ Hits          12173    12183   +10     
- Misses         4680     4681    +1     
- Partials        460      461    +1     

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