DEV: adds coverage configuration file and excluide exceptions from report

[Gui-FernandesBR]

Pull request type

• ReadMe, Docs and GitHub updates

Checklist

• Tests for the changes have been added (not needed)
• Docs have been reviewed and added / updated (not needed)
• Lint (black rocketpy/ tests/) has passed locally
• All tests (pytest tests -m slow --runslow) have passed locally
• CHANGELOG.md has been updated (not relevant)

New behavior

Added some regex rules to a new coverage configuration file to skip the raise exceptions from the tests coverage report.
These lines are not imported to be tested, and therefore not having them covered by tests is totally fine.

We should see a small increase in the coverage statistics.

Breaking change

• No (absolutely not)

Additional information

• https://coverage.readthedocs.io/en/latest/config.html

[Gui-FernandesBR]

An example:

[phmbressan]

Two main comments before approving this PR:

• I would like to hear your opinion on this matter: I do think that we could remove warnings from the coverage, but in my opinion exceptions shouls be asserted. This is specially relevant in the future when Custom Exceptions are implemented;
• It is high time we implemented a pyproject.toml file. This would simplify this PR by removing the need of a new "hidden" file .coveragerc.

[Gui-FernandesBR]

86f6570

Ok, I removed the line that deleted raise exceptions from the coverage reports. See 86f6570

I totally agree that we should create a pyproject.toml file, I created a issue here: #578