Add a dummy backend

src/backend/consumer/dummy.rs

@@ -0,0 +1,21 @@
+use async_trait::async_trait;
+use crate::{consumer::EventConsumer, event::Event, client::{ClientHandle, ClientEvent}};
+
+pub struct DummyConsumer;
+
+impl DummyConsumer {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+#[async_trait]
+impl EventConsumer for DummyConsumer {
+    async fn consume(&mut self, event: Event, client_handle: ClientHandle) {
+        log::info!("received event: ({client_handle}) {event}");
+    }
+    async fn notify(&mut self, client_event: ClientEvent) {
+        log::info!("{client_event:?}");
+    }
+    async fn destroy(&mut self) {}
+}