A ratelimited scheme

[Sixzero]

For most models there exists some kind of ratelimit, from free providers like Groq it is easier to reach.

Steps:
creation of first version of SlowSchema <: AbstractTracerSchema
creation of methods for initialize_tracer, finalize_tracer (it has some defaults, but you might to simply use it as a passthrough)
wrapping the GroqSchema to create FreeGroqOpenAISchema into the one above FreeGroqOpenAISchema = RateLimitSchema(GroqOpenAISchema, 30, Minute(1)) (So it is still callable like any other schema.