feat: Add `KCenters` 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

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.44%. Comparing base (e0ab1d3) to head (96026a3).

Files with missing lines	Patch %	Lines
...a/com/thealgorithms/greedyalgorithms/KCenters.java	94.73%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5806      +/-   ##
============================================
+ Coverage     69.43%   69.44%   +0.01%     
- Complexity     4688     4695       +7     
============================================
  Files           625      626       +1     
  Lines         17155    17174      +19     
  Branches       3307     3313       +6     
============================================
+ Hits          11911    11927      +16     
- Misses         4789     4790       +1     
- Partials        455      457       +2     

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