refactor: CircularQueue

[alxkm]

Make CircularQueue generic.
Readability improvements.
Added tests.

• 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 65.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 44.60%. Comparing base (f5c0314) to head (63c0312).

Files	Patch %	Lines
...lgorithms/datastructures/queues/CircularQueue.java	65.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5354      +/-   ##
============================================
+ Coverage     44.38%   44.60%   +0.22%     
- Complexity     2752     2765      +13     
============================================
  Files           522      522              
  Lines         15419    15413       -6     
  Branches       2942     2939       -3     
============================================
+ Hits           6843     6875      +32     
+ Misses         8282     8242      -40     
- Partials        294      296       +2     

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