[relay] Feature/relay integration (#2244)

This update adds new relay integration for NetBird clients. The new relay is based on web sockets and listens on a single port.

- Adds new relay implementation with websocket with single port relaying mechanism
- refactor peer connection logic, allowing upgrade and downgrade from/to P2P connection
- peer connections are faster since it connects first to relay and then upgrades to P2P
- maintains compatibility with old clients by not using the new relay
- updates infrastructure scripts with new relay service

util/net/dialer_nonios.go

@@ -49,6 +49,8 @@ func RemoveDialerHooks() {
 
 // DialContext wraps the net.Dialer's DialContext method to use the custom connection
 func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
+	log.Debugf("Dialing %s %s", network, address)
+
 	if CustomRoutingDisabled() {
 		return d.Dialer.DialContext(ctx, network, address)
 	}