fix(ci): gate event crate doctest behind mem feature and apply rustfmt

The crate-root doctest used InMemoryEventBus/TypedEventBus (gated behind
the 'mem' feature), so `cargo test -p mytheclipse-event --no-default-features
--features amqp|nats` failed to compile the doctest (E0432). The example is
now no_run with the mem-dependent imports inside a #[cfg(feature="mem")]
main, so it compiles (and runs) when mem is on and degrades to an empty main
when off.

Also apply rustfmt to mytheclipse-config/dynamic.rs and
mytheclipse-storage/{gcs,s3}.rs to satisfy cargo fmt --all --check.

crates/mytheclipse-storage/src/gcs.rs

@@ -160,6 +160,9 @@ mod tests {
             .await
             .unwrap();
         assert_eq!(data, b"hello gcs");
-        storage.delete("mytheclipse-storage-test.txt").await.unwrap();
+        storage
+            .delete("mytheclipse-storage-test.txt")
+            .await
+            .unwrap();
     }
 }