Static Analysis Results Interchange Format Metaschema module

[david-waltermire]

Committer Notes

Added minimal Metaschema module based on the Static Analysis Results Interchange Format (SARIF).

This uses #519 as a starting point and replaces that work.

Depends on #570, which needs to be merged first.

All Submissions:

• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
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Changes to Core Features:

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• [ ] 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 website](https://pages.nist.gov/metaschema) and readme documentation affected by the changes you made? Changes to the website can be made in the website/content directory of your branch.

[david-waltermire]

Note, the broken links are not caused by this PR. They are already broken in develop.

[david-waltermire]

This should be merged using "rebase and merge" to avoid merge conflicts in downstreams.

[iMichaela]

@david-waltermire - Could you do a rebase on the base branch to resolve the conflicts. Thank you.