ot-daemon: Add initial recipe for OpenThread posix daemon

The OpenThread repo offers a huge amount of build targets (most of them
for MCUs directly), but for this recipe we only build the Linux native
service and ctl commandline.

This runs as a service on a Linux host and connects to a radio
co-processor for Thread network access.

Closes: https://git.ostc-eu.org/OSTC/planning/core-os/-/issues/35



Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>