feat(managed): export managed client modules

crates/irtt-client/src/managed/mod.rs

@@ -0,0 +1,7 @@
+mod cancellation;
+mod hub;
+mod runner;
+
+pub use cancellation::CancellationToken;
+pub use hub::{EventHub, EventSubscription, SubscriberConfig, SubscriberOverflow};
+pub use runner::{ManagedClient, ManagedClientSession, SessionEndReason, SessionOutcome};