feat: improve space complexity of QuickSort algorithm

[DevAnuragT]

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Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Improved the space complexity of the QuickSort algorithm by removing additional arrays (GREATER and LESSER) and implementing in-place partitioning using swapping.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
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• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
  Fixes: [FEATURE]: Improve Quicksort Algorithm with Better Space Complexity #1703

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.68%. Comparing base (9010481) to head (40a9414).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1704      +/-   ##
==========================================
+ Coverage   84.65%   84.68%   +0.02%     
==========================================
  Files         378      378              
  Lines       19744    19775      +31     
  Branches     2951     2952       +1     
==========================================
+ Hits        16715    16746      +31     
  Misses       3029     3029              

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[appgurueu]

This PR is not an improvement as-is. We already have an in-place quick sort. By optimizing the out of place variant, we're left with essentially a duplicate implementation. That's a downgrade.

Acceptable alternatives would be to refactor the implementations, making it more clear what distinguishes them and perhaps clearing up some variable names and comments, or perhaps even removing the out-of-place implementation.