Add Count Nice Subarrays sliding using window algorithm

[tarunjgupta]

• 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 algorithms include a corresponding test class that validates their functionality.
• 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.
✅ Project coverage is 79.00%. Comparing base (fe6066b) to head (102ae33).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7206      +/-   ##
============================================
+ Coverage     78.98%   79.00%   +0.02%     
- Complexity     6907     6913       +6     
============================================
  Files           775      776       +1     
  Lines         22822    22843      +21     
  Branches       4482     4488       +6     
============================================
+ Hits          18025    18047      +22     
+ Misses         4077     4076       -1     
  Partials        720      720              

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[tarunjgupta]

Thank you for the review and for merging the PR!
I appreciate the helpful feedback.