OSCAL CLI constraint validation

[brandtkeller]

Describe what should be investigated or refactored

Integration of the oscal-cli for validating the OSCAL that Lula produces is both well-formed and valid.

Additional context

Integration would likely be in github actions until go-oscal supported this and could be imported into lula natively.

Need to ensure that oscal-cli can support the versions of OSCAL that Lula uses (1.1.2 now and 1.1.3 soon)

Expected Deliverable

• workflow for Lula producing artifacts to be analyzed by oscal-cli