test: ipc: unix: Add test for IPCUnixSocket

Test that the IPC supports sending data and file descriptors over the
IPC medium. To be able to execute the test two parts are needed, one
to drive the test and act as the libcamera (master) and a one to act as
the IPA (slave).

The master drives the testing posting requests to the slave to process
and sometimes respond to. A few different tests are performed.

- Master sends an array to the slave which responds with a reversed copy
  of the array. The master verifies that a reversed array is returned.

- Master tries to send an empty message making sure that the send call
  fails.

- Master sends a list of file descriptors and ask the slave to calculate
  and respond with the sum of the size of the files. The master verifies
  that the calculated size is correct.

- Master sends a pre-computed size and a list of file descriptors and
  asks the slave to verify that the pre-computed size matches the sum of
  the size of the file descriptors.

- Master sends two file descriptors and asks the slave to join the file
  contents in a new file and respond with its file descriptor. The
  master then verifies that the content of the returned file descriptor
  matches the order of the original two files.

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

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