support quic proxy (#993)

QUIC proxy works like kcp proxy, it can proxy TCP streams and transfer data with QUIC.
QUIC has better congestion algorithm (BBR) for network with both high loss rate and high bandwidth. 
QUIC proxy can be enabled by passing `--enable-quic-proxy` to easytier in the client side. The proxy status can be viewed by `easytier-cli proxy`.

easytier/src/peers/peer_map.rs

@@ -10,7 +10,7 @@ use crate::{
         global_ctx::{ArcGlobalCtx, GlobalCtxEvent, NetworkIdentity},
         PeerId,
     },
-    proto::{cli::PeerConnInfo, common::PeerFeatureFlag},
+    proto::{cli::PeerConnInfo, peer_rpc::RoutePeerInfo},
     tunnel::{packet_def::ZCPacket, TunnelError},
 };
 
@@ -194,12 +194,11 @@ impl PeerMap {
         None
     }
 
-    pub async fn get_peer_feature_flag(&self, peer_id: PeerId) -> Option<PeerFeatureFlag> {
+    pub async fn get_route_peer_info(&self, peer_id: PeerId) -> Option<RoutePeerInfo> {
         for route in self.routes.read().await.iter() {
-            let feature_flag = route.get_feature_flag(peer_id).await;
-            if feature_flag.is_some() {
-                return feature_flag;
-            };
+            if let Some(info) = route.get_peer_info(peer_id).await {
+                return Some(info);
+            }
         }
         None
     }