refactor: cleanup BucketSort

[alxkm]

Refactoring of BucketSort

Several improvements have been made:

1. Comment Refinement: Redundant comments were removed, and relevant descriptions were moved directly into method-level documentation.

2. Main Method Removal: The main method was removed as it was redundant. Testing can be effectively handled through the provided unit tests, or by writing a simple test case if needed.

3. Additional Unit Tests: New unit tests were added.

4. Stream API Usage: During refactoring Java Streams were introduced to simplify and modernize the code.

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 42.10%. Comparing base (7a5fe92) to head (92c792d).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5314      +/-   ##
============================================
+ Coverage     42.05%   42.10%   +0.05%     
- Complexity     2613     2619       +6     
============================================
  Files           522      522              
  Lines         15565    15565              
  Branches       2969     2964       -5     
============================================
+ Hits           6546     6554       +8     
+ Misses         8722     8715       -7     
+ Partials        297      296       -1     

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[siriak]

Looks good, thanks!