feat: Add `MergeKSortedArrays` 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 70.58%. Comparing base (04e421b) to head (c3309be).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5838      +/-   ##
============================================
+ Coverage     70.56%   70.58%   +0.02%     
- Complexity     4829     4830       +1     
============================================
  Files           645      646       +1     
  Lines         17472    17487      +15     
  Branches       3364     3368       +4     
============================================
+ Hits          12329    12344      +15     
  Misses         4680     4680              
  Partials        463      463              

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