Allow controller to spawn background tasks

[jc2k]

Allow controller to spawn background tasks

[Jc2k]

Would integrate with HASS via async_setup():

async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
    """Set up for Homekit devices."""
    map_storage = hass.data[ENTITY_MAP] = EntityMapStorage(hass)
    await map_storage.async_initialize()

    async_zeroconf_instance = await zeroconf.async_get_async_instance(hass)

    hass.data[CONTROLLER] = aiohomekit.Controller(
        async_zeroconf_instance=async_zeroconf_instance,
        char_cache=EntityMapStorage(hass),
    )

    await hass.data[CONTROLLER].start()

    hass.data[KNOWN_DEVICES] = {}
    hass.data[TRIGGERS] = {}

    async def _async_stop_homekit_controller(event: Event) -> None:
        await asyncio.gather(
            *(
                connection.async_unload()
                for connection in hass.data[KNOWN_DEVICES].values()
            )
        )
        await hass.data[CONTROLLER].stop()

    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, _async_stop_homekit_controller)