Metapath expression evaluator subcommand

[david-waltermire]

Committer Notes

This adds a new command that supports arbitrary Metapath evaluation in the command line interface (CLI).

The command is metaschema-cli metapath eval.

usage: metaschema-cli metapath eval -m=FILE_OR_URL --expression=EXPRESSION [<options>]
 -e,--expression=<EXPRESSION>   Metapath expression to execute
 -h,--help                      display this help message
 -i <FILE_OR_URL>               Metaschema content instance resource
 -m <FILE_OR_URL>               metaschema resource
    --no-color                  do not colorize output
 -q,--quiet                     minimize output to include only errors
    --show-stack-trace          display the stack trace associated with an error
    --version                   display the application version

This PR also fixes an issue for the little used JSON key feature that was causing JSON schemas to not be generated properly when this feature was used. This was causing issues with unit testing this PR.

This PR builds on #96 and usnistgov/metaschema-java#267.

Resolves usnistgov/metaschema-java#241.

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[aj-stein-gsa]

Non-blocking: I would like an example test of directly querying an instance of a document against the model in tests just to make it clear how it would work, but I am very happy with this new subcommand and will make plenty of use of it quite soon! 🚢

[wandmagic]

awesome to see this!
as soon as the 2.0.3 oscal CLI includes this i will. build integration into oscal-js and the test runner