Grove OpenAPI and Tool

[RawthiL]

The OpenAPI chain was added to the agent as a tool (a more modular approach), however the tested model (gpt-3.5-turbo) cannot use it correctly.
I think that the API definition is not clear enough. Also, I'm loading it from the YAML file provided by groove, there are others ways to do this using a markdown doc (as expected in Bashiru expample), but none was provided.

We need to improve the docs and re-test the OpenAPI based agent, if the gpt-3.5 cant make sense of the API docs then it will be very hard to adopt.