[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

relay/auth/doc.go

@@ -0,0 +1,26 @@
+/*
+Package auth manages the authentication process with the relay server.
+
+Key Components:
+
+Validator: The Validator interface defines the Validate method. Any type that provides this method can be used as a
+Validator.
+
+Methods:
+
+Validate(func() hash.Hash, any): This method is defined in the Validator interface and is used to validate the authentication.
+
+Usage:
+
+To create a new AllowAllAuth validator, simply instantiate it:
+
+	validator := &allow.Auth{}
+
+To validate the authentication, use the Validate method:
+
+	err := validator.Validate(sha256.New, any)
+
+This package provides a simple and effective way to manage authentication with the relay server, ensuring that the
+peers are authenticated properly.
+*/
+package auth