Add Krushkal's Minimum Spanning Tree algorithm

[PayalB24]

• 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.
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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.

Project coverage is 74.49%. Comparing base (2f2a32b) to head (a0461b6).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...healgorithms/graph/KruskalMinimumSpanningTree.java	0.00%	40 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6409      +/-   ##
============================================
- Coverage     74.65%   74.49%   -0.16%     
  Complexity     5459     5459              
============================================
  Files           682      683       +1     
  Lines         19010    19050      +40     
  Branches       3670     3676       +6     
============================================
  Hits          14191    14191              
- Misses         4259     4299      +40     
  Partials        560      560              

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[alxkm]

@PayalB24

Thanks for your contribution!

However, it looks like this algorithm already exists in the repository:

Kruskal:

https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/datastructures/graphs/Kruskal.java

https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/datastructures/graphs/KruskalTest.java

Feel free to improve the existing implementation or add more test cases if you find any missing scenarios.