Lifx IR brightness control

Lifx lights with infra-red security lighting currently have a select entity to control the IR brightness with “Disabled”, 25%, 50% and 100% options.

This alters the behaviour of the control exposed by the API, against Home Assistant’s design recommendations.

It is a control with 0-255 integer brightness steps, so this entity should actually be in the number domain with 0-100% or 0-255 integer ranges.

This would also make it consistent with the lifx.set_state service

- service: lifx.set_state
    entity_id: light.lifx_deck_spot
    infrared: 255