refactor: `InverseOfMatrix`

[alxkm]

Class cleanup. Readability improvements. Added tests.

• [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

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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