refactor: StackArray

[alxkm]

Added general interface.
Added test.
Made code generic.

• 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 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.35%. Comparing base (8605220) to head (7627699).

Files	Patch %	Lines
...healgorithms/datastructures/stacks/StackArray.java	95.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5349      +/-   ##
============================================
+ Coverage     44.11%   44.35%   +0.23%     
- Complexity     2733     2751      +18     
============================================
  Files           522      522              
  Lines         15437    15419      -18     
  Branches       2950     2942       -8     
============================================
+ Hits           6810     6839      +29     
+ Misses         8332     8284      -48     
- Partials        295      296       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.