Calm CLI - Pattern Validation

[grahampacker-ms]

Feature Request

Description of Problem:

A pattern instantiation should be able to be validated against a pattern JSON schema and spectral ruleset to ensure compliance with the pattern.

This relates to #53

Potential Solutions:

Using AJV, the pattern instantiation can be validated against the pattern JSON schema.
Using Spectral, additional validations that cannot be checked by the schema can be applied.
The result would be a pass or fail.
On a failure, any issues will be output to the user.

Future Considerations

In future, it should also be possible to validate a pattern against a meta-schema

Suggested commands:
calm validate --pattern [URL/file path] --instantiation [URL/file path]
calm validate -p [URL/file path] -i [URL/file path]

[jpgough-ms]

@lbulanti-ms please let us know when we can start using this tool (and the instructions) to debug interfaces 😃

[lbulanti-ms]

As part of this issue we decided that the meta schemas will be released with the cli and it won't be loaded in from the $schema property URL specified in the JSON Schema. The $schema property will be used as an ID and the URL does not need to point to a file according to the JSON Schema standards. This means that every calm version will always be compatible with the cli version that gets released with. @rocketstack-matt @jpgough-ms