actuation_player: Add unit tests

Add sample Trajectory and Kinematic State meant for testing. They have
been extracted from the main files and allow for faster and lighter
testing.

Test combinations of expected success and failure scenarios for the
Player library. This covers its different parameters: path, loop mode
and replay divider.

Issue-Id: SCM-5752
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
Change-Id: I4705161efe0347931f49ed0f45ad260d03c9a870