refactor: Enhance docs, add more tests in `DynamicArray`

[Hardvan]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.32%. Comparing base (d868982) to head (abfdb58).

Files with missing lines	Patch %	Lines
...thms/datastructures/dynamicarray/DynamicArray.java	50.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5952      +/-   ##
============================================
- Coverage     67.33%   67.32%   -0.01%     
+ Complexity     4572     4570       -2     
============================================
  Files           620      620              
  Lines         17147    17147              
  Branches       3312     3312              
============================================
- Hits          11546    11545       -1     
  Misses         5149     5149              
- Partials        452      453       +1     

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