Add task to heartbeat a tributary to the P2P code

coordinator/src/p2p/mod.rs

@@ -0,0 +1,30 @@
+use serai_client::primitives::NetworkId;
+
+mod reqres;
+use reqres::{Request, Response};
+
+mod gossip;
+
+mod heartbeat;
+
+struct Peer;
+impl Peer {
+  async fn send(&self, request: Request) -> Result<Response, tokio::time::error::Elapsed> {
+    (async move { todo!("TODO") }).await
+  }
+}
+
+#[derive(Clone, Debug)]
+struct P2p;
+impl P2p {
+  async fn peers(&self, set: NetworkId) -> Vec<Peer> {
+    (async move { todo!("TODO") }).await
+  }
+}
+
+#[async_trait::async_trait]
+impl tributary::P2p for P2p {
+  async fn broadcast(&self, genesis: [u8; 32], msg: Vec<u8>) {
+    todo!("TODO")
+  }
+}