Added MinimumWindowSubstring algorithm and test (Sliding Window)

[jaimin45-art]

• 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 86.20690% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.87%. Comparing base (4858ec9) to head (a00458c).

Files with missing lines	Patch %	Lines
.../thealgorithms/strings/MinimumWindowSubstring.java	86.20%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6813      +/-   ##
============================================
+ Coverage     77.85%   77.87%   +0.02%     
- Complexity     6359     6372      +13     
============================================
  Files           731      732       +1     
  Lines         21187    21216      +29     
  Branches       4140     4149       +9     
============================================
+ Hits          16495    16522      +27     
- Misses         4034     4035       +1     
- Partials        658      659       +1     

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[github-actions]

This pull request has been automatically closed because its workflows or checks failed and it has been inactive for more than 14 days. Please fix the workflows and reopen if you'd like to continue. Merging from main/master alone does not count as activity.