do some refactor

1. Route must impl PeerPacketFilter trait.
2. Use postcard lib to serial msg instead of bincode.
3. Fix cycle ref in peer_mgr & peer_rpc

easytier-core/src/peers/tests.rs

@@ -1,5 +1,7 @@
 use std::sync::Arc;
 
+use futures::Future;
+
 use crate::{
     common::{error::Error, global_ctx::tests::get_mock_global_ctx, PeerId},
     tunnels::ring_tunnel::create_ring_tunnel_pair,
@@ -48,3 +50,18 @@ pub async fn wait_route_appear_with_cost(
 pub async fn wait_route_appear(peer_mgr: Arc<PeerManager>, node_id: PeerId) -> Result<(), Error> {
     wait_route_appear_with_cost(peer_mgr, node_id, None).await
 }
+
+pub async fn wait_for_condition<F, FRet>(mut condition: F, timeout: std::time::Duration) -> ()
+where
+    F: FnMut() -> FRet + Send,
+    FRet: Future<Output = bool>,
+{
+    let now = std::time::Instant::now();
+    while now.elapsed() < timeout {
+        if condition().await {
+            return;
+        }
+        tokio::time::sleep(std::time::Duration::from_millis(50)).await;
+    }
+    assert!(condition().await, "Timeout")
+}