[feat]add idle check

rpc-framework-common/src/main/java/github/javaguide/enumeration/RpcMessageTypeEnum.java

@@ -5,6 +5,5 @@ package github.javaguide.enumeration;
  * @createTime 2020年06月16日 20:34:00
  */
 public enum RpcMessageTypeEnum {
-    HEART_BEAT,
-    RPC_REQUEST
+    HEART_BEAT
 }

rpc-framework-simple/src/main/java/github/javaguide/remoting/transport/netty/client/ChannelProvider.java

 package github.javaguide.remoting.transport.netty.client;
 
 import github.javaguide.factory.SingletonFactory;
-import github.javaguide.remoting.transport.netty.client.NettyClient;
 import io.netty.channel.Channel;
 import lombok.extern.slf4j.Slf4j;