refactor: Enhance docs, code, add tests in InsertDeleteInArray

[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 42.22222% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.74%. Comparing base (a0b6c52) to head (636d3cf).

Files with missing lines	Patch %	Lines
.../com/thealgorithms/others/InsertDeleteInArray.java	42.22%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6647   +/-   ##
=========================================
  Coverage     75.74%   75.74%           
- Complexity     5765     5774    +9     
=========================================
  Files           701      701           
  Lines         19757    19779   +22     
  Branches       3831     3830    -1     
=========================================
+ Hits          14964    14981   +17     
- Misses         4214     4218    +4     
- Partials        579      580    +1     

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