feat(codegen): Add JSON Schema to CTO utility

[mttrbrts]

Closes #294

This PR adds support for Concerto model generation from a small subset of JSON Schema.

Changes

• Adds a new CodeGen module in the style of the JSON document inference utility.
• Includes support for top-level schema definitions
• Includes support for primitive types, date-time formats and objects with properties.

Flags

• This feature is implemented using string manipulation to create the model. It would be greatly improved through the use of an Update API #293. This would also allow us to better handle sub-schemas.
• This feature should be considered experimental, as such I do not propose to document this publicly or add it to the Concerto CLI yet.
• Requires further unit test for exception paths to satisfy code-coverage requirements

Related Issues

• Issue Model generation from JSONSchema definition #294

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to master from fork:branchname

[dselman]

Very nice. We should be able to infer string regex and number range constraints as well?