feat: Two new algos 👍 `TowerofHanoi.java` and `GenerateUniqueSubset.java` added

[Tuhinm2002]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.18519% with 4 lines in your changes missing coverage. Please review.

Project coverage is 54.03%. Comparing base (87871ef) to head (52715aa).

Files with missing lines	Patch %	Lines
...thealgorithms/Recursion/GenerateUniqueSubsets.java	86.66%	2 Missing :warning:
...java/com/thealgorithms/Recursion/TowerOfHanoi.java	83.33%	2 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5546      +/-   ##
============================================
+ Coverage     53.96%   54.03%   +0.06%     
- Complexity     3387     3394       +7     
============================================
  Files           535      537       +2     
  Lines         15429    15456      +27     
  Branches       2942     2942              
============================================
+ Hits           8327     8352      +25     
- Misses         6749     6752       +3     
+ Partials        353      352       -1     

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[Tuhinm2002]

@siriak I have added few more important questions in the package. Few things I left because it was already covered either in backtracking or dynamic programming, so skipped them. The rest you can review it

[Tuhinm2002]

@alxkm Check I have added few missing popular algorithms of recursion.

[Tuhinm2002]

@vil02 can you review the PR please