- add: logout grpc function

- add: logout packet handler
- add: connection state and service for storing connection data
- add: session service calls to auth-service
- fix: compile error on database service due to moved redis cache

auth-service/build.rs

@@ -11,6 +11,6 @@ fn main() {
     tonic_build::configure()
         .build_server(false) // Generate gRPC client code
         .compile_well_known_types(true)
-        .compile_protos(&["../proto/user_db_api.proto"], &["../proto"])
+        .compile_protos(&["../proto/user_db_api.proto", "../proto/session_service_api.proto"], &["../proto"])
         .unwrap_or_else(|e| panic!("Failed to compile protos {:?}", e));
 }