refactor: Enhance docs, code, add tests in Huffman

[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

❌ Patch coverage is 63.76812% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.89%. Comparing base (2a004a0) to head (1df5f32).

Files with missing lines	Patch %	Lines
...rc/main/java/com/thealgorithms/others/Huffman.java	63.76%	20 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6646      +/-   ##
============================================
+ Coverage     76.79%   76.89%   +0.10%     
- Complexity     6055     6068      +13     
============================================
  Files           719      719              
  Lines         20364    20397      +33     
  Branches       3939     3951      +12     
============================================
+ Hits          15639    15685      +46     
+ Misses         4132     4115      -17     
- Partials        593      597       +4     

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[DenizAltunkapan]

Looks good, thanks @Hardvan !