Adding resource-fragment flag to link

[david-waltermire]

Defined a constraint to validate the allowed characters for a fragment. Resolves #756.

Committer Notes

Added a new flag to link name resource-fragment to indicate the URI fragment to append to any rlink associated with the referenced resource.
Resolves #756.

All Submissions:

• Have you selected the correct base branch per Contributing guidance?
• Have you set "Allow edits and access to secrets by maintainers
  "?
• 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]
• Do all automated CI/CD checks pass?

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

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you included examples of how to use your new feature(s)?
• Have you updated all OSCAL website and readme documentation affected by the changes you made? Changes to the OSCAL website can be made in the docs/content directory of your branch.

[wendellpiez]

Looks nice thanks Dave!

[aj-stein-nist]

Sorry for the delay. LGTM, I had to read RFC3986 3.5 more generally and experiment with regex to make sure I am understood the constraint aligns with intent in the docs.