add: connect to socket by community

direct messages/groups connect by channel id, everything else should connect by channel with the "is_channel" header set to true

crates/core/src/model/auth.rs

@@ -371,19 +371,12 @@ pub struct ExternalConnectionInfo {
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Default)]
 pub struct ExternalConnectionData {
     pub external_urls: HashMap<String, String>,
     pub data: HashMap<String, String>,
 }
 
-impl Default for ExternalConnectionData {
-    fn default() -> Self {
-        Self {
-            external_urls: HashMap::new(),
-            data: HashMap::new(),
-        }
-    }
-}
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Notification {