OpenAPI/JSON Schema Inference Enhancements

[mttrbrts]

This issue tracks future enhancements to the OpenAPI inference:

• Inference should generate Metamodel JSON rather than CTO. CTO printing can be added as necessary in a post-processing step
• Inferred concepts should have a @final decorator. This can be used during deserialisation to ensure that future sub-types are not supported. Related to Optimize JSON (De)serialization (Final Types et al) #482
• OpenAPI interference should be extended to support inline types for API operations. Today only named components / schemas are converted to concepts.
• Generated models should be decorated with their source operations or schema names to aid mapping back to the OpenAPI / JSON Schema document. e.g. @source("myspec.json#/components/schemas/account_branding_settings")
• The OpenAPI and JSON Schema inference should be refactored to decouple OpenAPI specific logic from the JSON Schema specific logic. Furthermore, we should adopt a more extensible pattern (such as Visitor, Transducer etc.)