No top level `Event` struct due to polymorphism

[grokify]

The RingCentral API uses a polymorphic Event definition where the body property can be one of several different properties depending on the event type.

The Swagger / OpenAPI 2.0 spec doesn't support this so right now we have the individual body structs but need to hand-create a top level Event struct.

The next step here would be to experiment with OpenAPI 3.0 spec to see if Swagger Codegen can auto-create a polymorphic struct using oneOf.

This is to explore:

• Hand creating an Event struct
• Moving to OpenAPI 3.0 spec for events and auto-generating the Event struct using oneOf

[grokify]

OpenAPI Generator has a discussion here:

OpenAPITools/openapi-generator#15