feat: upload codecov

[gemmadanks]

What changes did you make (give an overview)?

• Added GitHub action to upload code coverage report to codecov

Prerequisites checklist

Please check each of the following before merging:

• I have updated any relevant documentation
• I have added unit tests for any new code
• I have linked to any relevant issues
• I will squash my commits and, where needed, edit the commit messages to make them more informative follow the conventional commits format
• This pull request is ready to merge (leave unchecked to indicate a WIP)

What is the purpose of this pull request?

Check all that apply:

• Documentation update
• Bug fix
• New feature
• Changes to an existing feature
• Refactor
• Increasing test coverage
• Other, please explain:

[codecov-commenter]

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 ☂️