feat: move all json and validate to new utils

crates/delta/src/routes/invites/invite_join.rs

@@ -1,7 +1,8 @@
 use revolt_database::{util::reference::Reference, Channel, Database, Invite, Member, User, AMQP};
 use revolt_models::v0::{self, InviteJoinResponse};
 use revolt_result::{create_error, Result};
-use rocket::{serde::json::Json, State};
+use rocket::State;
+use crate::util::json::Json;
 
 /// # Join Invite
 ///