Add implementation-status-has-remarks Constraint

[Gabeblis]

Committer Notes

Purpose

This PR aims to add the implementation-status-has-remarks constraint which ensures that SSP statements include (via by-component assembly) with the following implementation status (partial, planned, alternative, or not-applicable) have remarks.

Changes

Added constraint:

• implementation-status-has-remarks

Added valid/invalid test content:

• ssp-implementation-status-has-remarks-INVALID.xml

Added yaml files for testing:

• Pass/fail yaml tests added for each of the above constraints.

All Submissions:

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• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you squashed any non-relevant commits and commit messages? [instructions]
• Have you added an explanation of what your changes do and why you'd like us to include them?
• If applicable, have all FedRAMP Documents Related to OSCAL Adoption affected by the changes in this issue have been updated.?
• If applicable, does this PR reference the issue it addresses and explain how it addresses the issue?

By submitting a pull request, you are agreeing to provide this contribution under the CC0 1.0 Universal public domain dedication.

[Rene2mt]

looks good!!