chore: generate coverage report and upload it to codecov

[vil02]

With this change, one can generate a coverage report by calling any command like

mvn test

A html, csv and xml reports are generated (this is useful for local development in my opinion).

The xml is uploaded to codecov.

Please note that this change still uses codecov/codecov-action in v3 - the update requires adding a token, so it will be done in a separate PR.

• 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 ✅

❗ No coverage uploaded for pull request base (master@c53f178). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5098   +/-   ##
=========================================
  Coverage          ?   37.13%           
  Complexity        ?     2331           
=========================================
  Files             ?      517           
  Lines             ?    15645           
  Branches          ?     2984           
=========================================
  Hits              ?     5809           
  Misses            ?     9548           
  Partials          ?      288           

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[vil02]

@BamaCharanChhandogi please have a look.