libcamera: shared_mem_object: Reorganize the code and document the SharedMemObject class

The SharedMemObject class template contains a fair amount of inline code
that does not depend on the template types T. To avoid duplicating it in
every template specialization, split that code to a separate base
SharedMem class.

We don't define copy semantics for the classes (we don't need one at the
moment) and we make them non-copyable since the default copy constructor
would lead to use-after-unmap.

Doxygen documentation by Dennis Bonke and Andrei Konovalov.

Reviewed-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Co-developed-by: Dennis Bonke <admin@dennisbonke.com>
Signed-off-by: Dennis Bonke <admin@dennisbonke.com>
Signed-off-by: Andrei Konovalov <andrey.konovalov.ynk@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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