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Returns the list of keys supported by this Android.Hardware.Camera2.CameraDevice for querying with a Android.Hardware.Camera2.CaptureRequest.
The list returned is not modifiable, so any attempts to modify it will throw a UnsupportedOperationException.
Each key is only listed once in the list. The order of the keys is undefined.
Note that there is no getAvailableCameraCharacteristicsKeys() -- use CameraCharacteristics.getKeys() instead.