test: test coverage

[inigomarquinez]

Description

Add test coverage report and gh action to upload the coverage to Code Climate

Related Issue

onebeyond/maintainers#131

Motivation and Context

onebeyond/maintainers#131

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.