Improve validation api

[david-waltermire]

Committer Notes

Refactored the Metaschema validation API to allow for more flexibility in use. Improved abstract CLI validation commands to provide more options for model detection.

This PR depends on https://github.com/usnistgov/metaschema-java/pull/367, which should be merged before this PR.

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Changes to Core Features:

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[david-waltermire]

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