Initial draft of a validation testing framework (Tests 6.1.1-6.1.7)

[oxisto]

This is work in progress, but it tries to provide an API for the implementation of 6.1 mandatory tests for validation.

It also adds a couple of 6.1.x tests as an example

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
...tlin/io/github/csaf/sbom/validation/Requirement.kt	100.00% <100.00%> (ø)
...io/github/csaf/sbom/validation/ValidationResult.kt	100.00% <100.00%> (ø)
.../csaf/sbom/validation/requirements/Requirements.kt	85.41% <100.00%> (+0.31%)	⬆️
...io/github/csaf/sbom/validation/tests/Extensions.kt	100.00% <100.00%> (ø)
...tlin/io/github/csaf/sbom/validation/tests/Tests.kt	100.00% <100.00%> (ø)

[KuechA]

It's sometimes not really straightforward to relate the paths mentioned in the spec to the code but it should match in most cases. Also, some descriptions would help sometimes.

[lawid]

I stumbled on the term "Branche", any chance we can refer to the singular of "Csaf.Branche" as "Branch" instead?

WITHDRAWN: I'm having trouble with the submodules (yes i ran init and update), shouldn't there be a .gitmodules file?