* Add wait_for_next_keyframe option to stream images
Add STREAM_SNAPSHOT to CameraEntityFeature
Use wait_for_next_keyframe option for snapshots using stream
* Update stream test comments
* Add generic camera snapshot test
* Get stream still images directly in camera
Remove getting stream images from generic, nest, and ONVIF
Refactor camera preferences
Add use_stream_for_stills setting to camera
Update tests
* Only attempt to get stream image if integration supports stream
* Use property instead of entity registry setting
* Split out getting stream prerequisites from stream_source in nest
* Use cached_property for rtsp live stream trait
* Make rtsp live stream trait NestCamera attribute
* Update homeassistant/components/nest/camera.py
Co-authored-by: Allen Porter <allen.porter@gmail.com>
* Change usage of async_timeout
* Change import formatting in generic/test_camera
* Simplify Nest camera property initialization
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Co-authored-by: Allen Porter <allen.porter@gmail.com>
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