feat(auth): add authentication protocol definitions and build configuration

- Add TokenClaims message for JWT payload structure with user id, issuer, timestamps, and scopes
- Implement IssueTokenRequest/Response for creating access and refresh tokens with TTL support
- Create RefreshTokenRequest/Response for token rotation functionality
- Define RevokeTokenRequest/Response with support for single token or user-wide revocation
- Add VerifyTokenRequest/Response for validating JWT tokens with detailed claims information
- Implement signing key distribution system with GetSigningKeysRequest/Response
- Create TokenService gRPC service with IssueToken, RefreshToken, RevokeToken, VerifyToken, and GetSigningKeys methods
- Add build.rs configuration to compile proto files using tonic_prost_build
- Include channel, channel_settings, member, and permission protocol definitions for IM services
- Generate Rust code bindings through pb/core.rs and pb/im.rs modules

socket/mod.rs

@@ -0,0 +1,16 @@
+pub mod adapter;
+pub mod message_bus;
+pub mod namespace;
+pub mod packet;
+pub mod parser;
+pub mod server;
+pub mod session_store;
+pub mod socket;
+
+pub use adapter::{Adapter, AdapterError, BroadcastOptions, BroadcastFlags, BusMessage, LocalAdapter, RedisAdapter, NatsAdapter, SocketInfo};
+pub use message_bus::{MessageBus, MessageBusError, RedisMessageBus, NatsMessageBus};
+pub use namespace::{is_valid_namespace, Namespace, NamespaceManager};
+pub use packet::{Packet, PacketType};
+pub use server::{SocketServer, SocketServerBuilder};
+pub use session_store::{InMemorySessionStore, RedisSessionStore, SessionError, SessionInfo, SessionStoreTrait};
+pub use socket::Socket;