libcamera: pipeline_handler: Document the threading model

Document the threading model of the PipelineHandler class (and all its
derived classes). The model is already enforced by the Camera class, so
no change in the implementation is required. As for the Camera class,
disconnection is currently left out.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

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