Entity service

[balloob]

Description:

Introduces a new helper to help entity components defining services. Bonus: when executing a service, will run entities of different platforms in parallel. This should give a significant boost if you are controlling, for example, a Hue and a LIFX bulb at the same time.

Approach 1: Will call entity.async_open_cover

component = EntityComponent(_LOGGER, DOMAIN, hass)

component.async_register_entity_service(
    SERVICE_OPEN_COVER, COVER_SERVICE_SCHEMA,
    'async_open_cover'
)

Approach 2: Will call passed in function with entity, call and expects coroute returned

component = EntityComponent(_LOGGER, DOMAIN, hass)

component.async_register_entity_service(
    SERVICE_OPEN_COVER, COVER_SERVICE_SCHEMA,
    lambda entity, call: entity.async_open_cover()
)

Related issue (if applicable): #15989

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[MartinHjelmare]

Wow!

[MartinHjelmare]

Looks awesome. Just needs tests I guess.

[pvizeli]

That is a perfect

[balloob]

It doesn't need tests as all entity components have tests for all services already (famous last words)

[balloob]

Right now we call all commands in sequence. We should explore leveraging the PARALLEL_UPDATES constant on platforms to see if we can go faster.