feat: forbid certain usernames & room aliases

squashed from https://gitlab.com/famedly/conduit/-/merge_requests/582

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/client_server/alias.rs

@@ -26,6 +26,17 @@ pub async fn create_alias_route(
         ));
     }
 
+    if services()
+        .globals
+        .forbidden_room_names()
+        .is_match(body.room_alias.alias())
+    {
+        return Err(Error::BadRequest(
+            ErrorKind::Unknown,
+            "Room alias is forbidden.",
+        ));
+    }
+
     if services()
         .rooms
         .alias