probeCameraInventory
Probes the camera inventory via CameraManager without opening any camera.
Reports camera count, concurrent-camera set count (Android 11+) and a hash of lens facings. Reading CameraCharacteristics does not require the CAMERA permission.
Privacy: metadata-only (no capture); contributes to hardware fingerprinting. This is the passive counterpart to the permissioned Cameras collector.
Return
Map of probe keys to camera-inventory values, or null on failure.
Parameters
context
Context used to obtain CameraManager.