Make Signal Service listen on a standard 443/80 port instead of 10000 (#396)

Right now Signal Service runs the Let'sEncrypt manager on port 80
and a gRPC server on port 10000. There are two separate listeners.
This PR combines these listeners into one with a cmux lib.
The gRPC server runs on either 443 with TLS or 80 without TLS.
Let's Encrypt manager always runs on port 80.

infrastructure_files/docker-compose.yml.tmpl

@@ -25,7 +25,7 @@ services:
     volumes:
       - $SIGNAL_VOLUMENAME:/var/lib/netbird
     ports:
-      - 10000:10000
+      - 10000:80
   #     # port and command for Let's Encrypt validation
   #      - 443:443
   #    command: ["--letsencrypt-domain", "$NETBIRD_DOMAIN", "--log-file", "console"]