Add Codecov support for better code coverage tracking

[dodu94]

Description

Code coverage is very important for a software like JADE that is used as V&V tool itself. This PR connects JADE to Codecov in order to get coverage results in CI for easier monitoring with respect to current method which computes the coverage reports and hosts them on the GitHub actions as artifacts.

Fixes #314

Type of change

Please select what type of change this is.

• Bug fix (non-breaking change which fixes an issue)
• New benchmark
  • Non-breaking change which entirely uses exisiting classes, structure etc
  • Breaking change which has implemented new/modified classes etc
• New feature
  • Non-breaking change which adds functionality
  • Breaking change fix or feature that would cause existing functionality to not work as expected

Testing

N.A.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• General testing
  • New and existing unit tests pass locally with my changes
  • Coverage is >80%

[codecov]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

ℹ️ You can also turn on project coverage checks and project coverage reporting on Pull Request comment

Thanks for integrating Codecov - We've got you covered ☂️