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-event/src/lib.rs

@@ -15,20 +15,27 @@
 //!
 //! ## Example
 //!
-//! ```
-//! use mytheclipse_event::{EventBus, InMemoryEventBus, TypedEventBus};
+//! The in-memory + typed bus (`mem` feature, on by default):
+//!
+//! ```no_run
 //! use serde::{Deserialize, Serialize};
 //!
 //! #[derive(Debug, Serialize, Deserialize, PartialEq)]
 //! struct OrderCreated { id: u64 }
 //!
-//! # #[tokio::main] async fn main() {
-//! let bus = TypedEventBus::new(InMemoryEventBus::default());
-//! let mut sub = bus.subscribe::<OrderCreated>("orders").await.unwrap();
-//! bus.publish("orders", &OrderCreated { id: 42 }).await.unwrap();
-//! let event = sub.recv().await.unwrap();
-//! assert_eq!(event, OrderCreated { id: 42 });
-//! # }
+//! #[cfg(feature = "mem")]
+//! #[tokio::main]
+//! async fn main() {
+//!     use mytheclipse_event::{EventBus, InMemoryEventBus, TypedEventBus};
+//!     let bus = TypedEventBus::new(InMemoryEventBus::default());
+//!     let mut sub = bus.subscribe::<OrderCreated>("orders").await.unwrap();
+//!     bus.publish("orders", &OrderCreated { id: 42 }).await.unwrap();
+//!     let event = sub.recv().await.unwrap();
+//!     assert_eq!(event, OrderCreated { id: 42 });
+//! }
+//!
+//! #[cfg(not(feature = "mem"))]
+//! fn main() {}
 //! ```
 
 pub mod traits;