[ENH] Allow datacite.yml in dataset root

[effigies]

The DataCite Metadata Schema (https://schema.datacite.org/meta/kernel-4/) is a fairly comprehensive structure for describing citable datasets, including contributors (including organizations and contributor roles), funders, licenses and abstracts.

The DataCite Metadata Working Group publish XSD and Invenio hosts JSON-Schema translations at https://github.com/inveniosoftware/datacite/tree/master/datacite/schemas.

Following the lead of CITATION.cff, we would use YAML, a superset of JSON that is interpreted as a JSON-compatible object.

I would propose that we add the Invenio JSON-Schema documents to the jsr:@bids/schema package, similar to https://jsr.io/@bids/schema/1.1.0/citation/schema.json.

Closes #1955.

TODO:

• Add schema checks for MUST/SHOULD statements.
• Recommend against having both CITATION.cff and datacite.yml? They could get out-of-sync, but if someone was syncing them, it might make the dataset legible to more tools.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.71%. Comparing base (5e8d37f) to head (137c220).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2221   +/-   ##
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  Coverage   82.71%   82.71%           
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  Files          20       20           
  Lines        1608     1608           
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  Hits         1330     1330           
  Misses        278      278           

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