WIP - introduce an API that waits for events

[th3w1zard1]

A crazy idea to keep things future-proof with an infinite amount of customization options.

the basic problem with the integration is allowing users to customize anything and everything like home assistant users love to do 😄

This WIP intends to fire events with the currently attempted data (e.g. values from calc_brightness_pct), fire those in an event to HASS, wait for hass automation to see the trigger and fire an event with the replacement data, and simply use that in our functions instead.
A full API. Why create features users ask for when instead we can implement ways for them to do it themselves to decrease the overall todo list (i.e. change_switch_settings)

Probably nothing good here. Had fun learning about async timers & tasks though. Another idea is loading custom python functions from the config which users can set with change_switch_settings or the config flow.