feat: Add ToggleNthBit algo with JUnit tests

[Tanmay-Singh3004]

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 63.92%. Comparing base (4a03f42) to head (636ee0c).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5739      +/-   ##
============================================
+ Coverage     63.91%   63.92%   +0.01%     
- Complexity     4167     4169       +2     
============================================
  Files           582      583       +1     
  Lines         16302    16303       +1     
  Branches       3148     3148              
============================================
+ Hits          10419    10422       +3     
+ Misses         5457     5456       -1     
+ Partials        426      425       -1     

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[alxkm]

Nice contribution, but it looks like this code already exists here:
https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/SingleBitOperations.java

[Tanmay-Singh3004]

@alxkm
Thank you for the feedback! After checking the SingleBitOperations class, I realize that the functionality I was working on is already covered. I'll close this PR and look for another area where I can contribute.

I'm new to open-source contributions and had a few challenges initially, but I'm really enjoying contributing to this repository!