Safety Island: Add a Zephyr application

The Zephyr application provides the functionality of the Pure Pursuit
algorithm. The algorithm is derived from the pure_pursuit package of
Autoware.Auto, modified to remove its ROS2 dependency and use direct
calls to CycloneDDS instead.

The build script allows to build the required host tools from
CycloneDDS as well as the application itself.

The provided board configurations and device tree allow to build for the
NXP S32Z27 development board target.

Issue-Id: SCM-5893
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
Change-Id: I6e845cc36ad8f708433f901ac1d007f2afbdd674