jambonz => websocket server

An llm:tool-call message is sent by jambonz to the application when an LLM being managed by jambonz (i.e., the llm verb) has called a function or tool that the application needs to implement.

The payload will include the following properties:

• name: the name of the function,
• call_id: an identifier that must be returned in the llm:tool-output method sent by the application to return function call results, and
• args: an object containing the parameters provided as part of the function call