feat(telemetry): expose current fleet device and endpoint counts

wakey-control-plane/src/api/control.rs

@@ -13,5 +13,6 @@ pub use enroll::{
     set_agent_nickname,
 };
 pub(crate) use fleet::FleetCache;
+pub(crate) use fleet::sample_fleet_counts;
 pub use fleet::{list_fleet_devices, refresh_fleet_devices, wake_fleet_device};
 pub use stats::{StateStatsResponse, state_stats};