Add proof-of-concept server intercom service through auth server

rc_auth/src/robocraft/intercom/mod.rs

@@ -0,0 +1,8 @@
+mod internal_auth;
+pub use internal_auth::{IntercomAuth, IntercomOpError};
+
+mod services;
+pub use services::{services_ws, service_msg};
+
+mod user_registry;
+pub use user_registry::Users;