Addition of @assistant.on("function_calls_started")

[birksy89]

Would it be possible to add something like: @assistant.on("function_calls_started")

We currently have @assistant.on("function_calls_finished")... But some of the functions which I'm calling take a couple of seconds to respond with data.

It would be great to be able to tap into a "starting" state, where I could then:

await assistant.say("Hmmm, let me just look that up for you - Give me 2 seconds.")

Any advice or input would be greatly appreciated