Define formal primitives specification

The JSON primitives files can be fairly large and complicated and susceptible to misspecification. Implement a formal specification for the JSON files using json schema

• define the specification in JSON schema (I suggest using the jsonschema package from PyPI)

• implement a validator to validate a JSON primitive file:

    from mlprimitives.validation import validate
    primitive = load_primitive_from_json()  # or similar
    primitive = validate(primitive)
  

Start by reviewing the existing JSON primitives files and the proposed validation entry point, mlprimitives.validation.validate. Define the JSON Schema for the primitive structure and determine how a loaded primitive should be validated using the jsonschema package. Done means the schema exists, validation is exposed through the stated interface, and primitive files can be checked consistently.