Small code cleaning in the iface package. These changes necessary to
get a clean code in case if we involve more platforms. The OS related
functions has been distributed into separate files and it has been
mixed with not OS related logic. The goal is to get a clear picture
of the layer between WireGuard and business logic.
If the gateway address would be nil which is
the case on macOS, we return the preferredSrc
added tests for getExistingRIBRouteGateway function
update log message
Handle routes updates from management
Manage routing firewall rules
Manage peer RIB table
Add get peer and get notification channel from the status recorder
Update interface peers allowed IPs
