Fix services schema and improve selectors

[KapJI]

• Changing dict to vol.Schema changed behaviour of services and they lost automatic entity_id field. Bring it back.
• type: ignore can be removed once Fix typing for entity_platform.async_register_entity_service home-assistant/core#103777 is merged and released.
• Add selectors to filter entities from google_home integration.
• Allow to reboot multiple devices with single google_home.reboot call.
• Modernise code base a bit, e.g. use async_get_current_platform() and pass async functions directly to async_register_entity_service which also changes behaviour a bit and they start receiving ServiceCall.
• Tested all services locally this time.

Fixes #786, #790

[leikoilja]

Nice, thanks for fixing it! 🚀