feat: Add CelebrityFinder new algorithm with Junit tests

[Hardvan]

• 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

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.04%. Comparing base (776946e) to head (6b18afa).

Files with missing lines	Patch %	Lines
...java/com/thealgorithms/stacks/CelebrityFinder.java	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5756      +/-   ##
============================================
+ Coverage     66.01%   66.04%   +0.03%     
- Complexity     4402     4408       +6     
============================================
  Files           604      605       +1     
  Lines         16812    16827      +15     
  Branches       3227     3232       +5     
============================================
+ Hits          11098    11113      +15     
+ Misses         5267     5266       -1     
- Partials        447      448       +1     

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[alxkm]

This contribution looks like from leetcode. And according to rules, could you please provide any sources that describe that this is not from leetcode or similar resources.

[Hardvan]

Here are a list of resources that explain the Celebrity Finding algorithm using Stacks:

• Scaler - The Celebrity Problem
• Unraveling the Celebrity Problem: A Solution Using Stacks