experiment with converting oscal schema into .proto

[bdw617]

in theory we could convert the oscal schemas into .proto. The advantage of this is it will provide serialization/deserialization that would be language independent. I know there's oscal stuff around format of strings, which wouldn't be straight up .proto, but that needs investigation how to add regex formatting of data enforced when generating proto message objects language independent.

This is just a very high level idea.