Adds Metadata describer

[Richard-Gist]

Checklist:

• [x] Did you sign the Contributor License Agreement?
• [x] Is the linter reporting 0 errors? 0 Errors for the code in this PR
• [ ] Did you comply with our styleguide?
• [ ] Is there adequate test coverage for your new code?
• [x] Does the CI pipeline pass? For what this PR touches
• [x] Did you update the documentation?
• [ ] Have you done everything you can to make sure that errors that can occur are compile-time errors, and if they have to be runtime do you have adequate tests and documentation around those runtime errors? For more details.

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (data-driven@1d430cb). Click here to learn what that means. The diff coverage is n/a.

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##             data-driven     #155   +/-   ##
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  Coverage               ?   89.70%           
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  Files                  ?       96           
  Lines                  ?     2506           
  Branches               ?        0           
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  Hits                   ?     2248           
  Misses                 ?      258           
  Partials               ?        0           

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[Richard-Gist]

I think this is probably good enough to start updating this to Ready for Review. I'm out for most if not all of next week (and tomorrow) so if we want to make more progress on this, feel free to take it and keep working on it without me.

[morganzellers]

Looks like the linter is only failing due to two TODOs that I feel are appropriate to stay until data-driven merges into main, so I'm approving & merging.