Multi Module Code Coverage

[wba2hi]

Is your feature request related to a problem? Please describe.
n. a.

Describe the solution you'd like
Add Code Coverage for the SDK

Describe alternatives you've considered

1. Minimum viable solution:

• all module reports are added to the pipeline

2. Optimal solution

• all different module reports (unit tests / instrumentationt tests) are generated and aggregated to one single report (this step might be optional if the corresponding plugin can handle multiple reports)
• might require adding some custom gradle tasks
• code coverage is shown on CI/CD and / or GitHub Page

Additional context

• the flag "testCoverageEnabled true" made issues in the past with different coverage reporters (leading to reports showing a coverage of 0 when enabled) - while most of these projects did not have instrumentation tests we have them and won't be able to leave the flag disabled.
• https://github.com/marketplace/actions/code-coverage-summary
• https://github.com/marketplace/codecov

[wba2hi]

A follow-up issue (#89) was created to show code coverage as a badge therefore only the minimum viable solution was chosen and no CI/CD integration exists.

Code Coverage can be found in "Artifacts" of "Build Main" and "Validate Pull Request" GitHub Actions:
https://github.com/eclipse-kuksa/kuksa-android-sdk/actions?query=branch%3Amain -> "Build Main" -> Summary -> Scroll down to artifacts -> code-coverage