Added Label Properties to 800-53 Rev 4 Groups

[brian-ruf-ezd]

Committer Notes

Added label properties to groups in NIST SP 800-53 r4, so that tools that honor the label property will have data to use.

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[iMichaela]

@brian-comply0 - Thank you for splitting the proposed changes into separate PRs.
PLEASE NOTE- The PR needs to be submitted against develop or a feature-[issue] branch and not main branch.
I am not convinced 800-53 Rev4 needs such enhancement not justified by the original data set. I am waiting on the community to weigh in and provide their perspective.

[iMichaela]

@brian-ruf-ezd - The SP 800-54 rev4 is withdrawn by the NIST RMF team and therefore NIST OSCAL team is no longer maintaining the associated OSCAL artifacts. We keep them on our website for now, but they cannot be updated past OSCAL v1.1.1 without substantial work we see no reason to invest in. If you have a different perspective, please share it and we can further discuss this PR if you maintain the request.