feat: Add Stoer-Wagner Algorithm for Minimum Cut

[sairamsharan]

• 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

❌ Patch coverage is 94.28571% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.44%. Comparing base (8b8434c) to head (8b762e4).

Files with missing lines	Patch %	Lines
...main/java/com/thealgorithms/graph/StoerWagner.java	94.28%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6752      +/-   ##
============================================
+ Coverage     77.42%   77.44%   +0.01%     
- Complexity     6208     6221      +13     
============================================
  Files           722      723       +1     
  Lines         20680    20715      +35     
  Branches       4019     4029      +10     
============================================
+ Hits          16012    16043      +31     
- Misses         4055     4057       +2     
- Partials        613      615       +2     

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