[DX] Generate a normalized OpenAPI schema

[Korbeil]

Is your feature request related to a problem? Please describe. When generating from a vendor OpenAPI schema, we don't have all information inside this vendor schema because operationId, for example, is guessed based on some contraints on Jane side (unicity, existing fields ...)

Describe the solution you'd like Jane should generated should generate a clean OpenAPI definition with all he used to generate the client.