Ability to specify multiple functions on non-llm tool

[slonoed]

Currently, when you using non llm tool the only method called will be ask. And it will receive 2 arguments (params and thread id).
It would be nice if tool can specify multiple functions and either

1. Having some argument in ask to figure out which one is called
2. Perform automatic routing to class function

Example

class FnTool extends Tool {
  constructor() {
    super({
      llm: false,
      parentTools: [/* describe both functions here */]
    })
  }
  storeList(items) {
    // ..
  }
 
  getList() {
    return ['apple', 'banana']
  }
}