test: Add test case for signal delivery across threads

The test case creates a receiver inheriting from Object, connects a
signal to one of its slot, moves the receiver to a different thread,
emits the signal and verifies that it gets delivered in the correct
thread with the expected value.

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

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