[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

infrastructure_files/configure.sh

@@ -89,6 +89,11 @@ fi
 
 export TURN_EXTERNAL_IP_CONFIG
 
+# if not provided, we generate a relay auth secret
+if [[ "x-$NETBIRD_RELAY_AUTH_SECRET" == "x-" ]]; then
+  export NETBIRD_RELAY_AUTH_SECRET=$(openssl rand -base64 32 | sed 's/=//g')
+fi
+
 artifacts_path="./artifacts"
 mkdir -p $artifacts_path