This is still under development, but is able to open a camera and send/receive requests/responses.
The raw libcamera APIs require a lot of careful management of memory ownership in order to use
correctly. To avoid exposing this to Rust users, we internally keep dependencies alive through
Arc references to them. For example, the Camera struct contains an Arc<CameraManager> to
ensure that no Cameras exist after the CameraManager has been shutdown. More specific
implementation notes are provided below.