don't rate limit appservices if the registration file says they shouldn't be

src/api/ruma_wrapper/axum.rs

@@ -324,7 +324,11 @@ where
         let target = if let Some(server) = sender_servername.clone() {
             Target::Server(server)
         } else if let Some(appservice) = appservice_info.clone() {
-            Target::Appservice(appservice.registration.id)
+            if appservice.registration.rate_limited.unwrap_or(true) {
+                Target::Appservice(appservice.registration.id)
+            } else {
+                Target::None
+            }
         } else if let Some(user) = sender_user.clone() {
             Target::User(user)
         } else {

src/service/rate_limiting/mod.rs

@@ -55,6 +55,10 @@ impl Service {
     }
 
     pub fn update_or_reject(&self, target: Target, metadata: Metadata) -> Result<(), Duration> {
+        if target == Target::None {
+            return Ok(());
+        }
+
         let restriction = metadata.into();
 
         let arrival = Instant::now();