Ability to set the `source-profile` link `@href` value

[david-waltermire]

User Story:

As an liboscal-java user, I would like for the ability to set the source-profile link @href value to a user provided path on profile resolution.

Goals:

• Allow for relative source-profile link @href values to be included on the output.
  • The current output (example shown below) is likely to be of little benefit to the consumers of the resolved profile.

     <link href="file:/C:/tmp/liboscal-java/oscal/src/specifications/profile-resolution/profile-resolution-examples/base-test_profile.xml" rel="source-profile"/>

     <link href="file:///tmp/liboscal-java/oscal/src/specifications/profile-resolution/profile-resolution-examples/base-test_profile.xml" rel="source-profile"/>

• Optionally support the usage of the canonical /profile/metadata/link/@rel value.

Dependencies:

None

Acceptance Criteria

• All OSCAL website and readme documentation affected by the changes in this issue have been updated. Changes to the OSCAL website can be made in the docs/content directory of your branch.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.
• The CI-CD build process runs without any reported errors on the PR. This can be confirmed by reviewing that all checks have passed in the PR.