Invalid schema for `InsertBlock`: `oneOf` is not supported

[jamwil]

Hmm it doesn't no, but I feel like these things are JSON schemas at the end of the day so I'll merge this and add the oneOf sub schema property to InsertBlock and ShowNumberedContext:

https://json-schema.org/understanding-json-schema/reference/combining

I'm getting an error against openrouter/openai: \"Invalid schema for function 'InsertBlock': schema must have type 'object' and not have 'oneOf'/'anyOf'/'allOf'/'enum'/'not' at the top level.\"

I guess they only support a sub-set of JSON schema.

Originally posted by @jamwil in #275 (comment)