Handle auth for claude (#36442)

We'll now use the anthropic provider to get credentials for `claude` and
embed its configuration view in the panel when they are not present.

Release Notes:

- N/A

crates/gpui/src/subscription.rs

@@ -201,3 +201,9 @@ impl Drop for Subscription {
         }
     }
 }
+
+impl std::fmt::Debug for Subscription {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Subscription").finish()
+    }
+}