This migrates the subsys code samples to the new Sphinx code-sample
extension, making it easier to find relevant samples when browsing
API reference.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
Add an option to build the sample with application-layer clock sync
service running in the background.
This will also add a build-check for the clock sync service in CI.
Signed-off-by: Martin Jäger <martin@libre.solar>
