Added link that sends messages over ipc_service. It uses
log_link_remote and will talk to log_backend_ipc_service based
on log_link_backend.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
Added implementation of link and backend that are intended to
complement each other. Both requires transport function hooks
to be provided.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>