Added Label Properties to 800-53 Rev 5 Groups

[brian-comply0]

Committer Notes

Added label properties to groups in NIST SP 800-53 r5, 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 enhancements into two distinct PRs.
PLEASE NOTE- The PR needs to be submitted against develop or a feature-[issue] branch and not main branch.
I think this enhancement has great justification and aligns with the CPRT representation of 800-53 rev 5.1.1 (NIST's source of truth). I am waiting for the community to review and ensure their tools or automation process will not require updates they are against. I will give 2 weeks to the community to weigh in. It takes seconds to understand. We still need to work with our team to determine necessary testing @Wendell mentioned in the #268 discussion.