refactor: InverseOfMatrix

[alxkm]

Class cleanup.
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

All modified and coverable lines are covered by tests ✅

Project coverage is 51.99%. Comparing base (bded78f) to head (1c16987).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5446      +/-   ##
============================================
+ Coverage     51.60%   51.99%   +0.38%     
- Complexity     3216     3235      +19     
============================================
  Files           524      524              
  Lines         15187    15169      -18     
  Branches       2893     2889       -4     
============================================
+ Hits           7838     7887      +49     
+ Misses         7024     6958      -66     
+ Partials        325      324       -1     

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