* Add an entity service for saving nest event related snapshots
Add an entity service `nest.snapshot_event` for recording camera event
related media to disk. This is based on `camera.snapshot` but takes in
a parameter for a Nest API event_id.
PR #58299 adds `nest_event_id` to events published by nest so that they can
be hooked up to this service for capturing events.
Future related work includes:
- Height & Width parameters for the rendered image
- Support video clips for new battery cameras
- An API for proxying media related to events, separate from the camera image thumbnail
- A Nest MediaSource for browsing media related to events
* Revert debugging information
* Add test coverage for OSError failure case
* Add service description for nest snapshot service
* Reduce unnecessary diffs.
* Sort nest camera imports
* Remove unnecessary if block in snapshot
