Manual update service

[DrMikeyS]

Is your feature request related to a problem? Please describe.
Sometimes you want to check a timer has been cancelled or see if any have recently changed. Waiting for the automatic update is a frustration.

Describe the solution you'd like
A service that can trigger an update. Basically a "refresh" option that can be called.

[leikoilja]

Actually a really nice suggestion that can help us mitigate google home server (on device) timeouts. Instead of us trying to poll devices as often as we can trying to avoid device timeouts, we can rather provide a service to manually update the sensors on request