use ObByteBuf to reduce allocate tmp byte array

Author: GroundWu

src/main/java/com/alipay/oceanbase/rpc/protocol/payload/AbstractPayload.java

@@ -17,6 +17,7 @@
 
 package com.alipay.oceanbase.rpc.protocol.payload;
 
+import com.alipay.oceanbase.rpc.util.ObByteBuf;
 import com.alipay.oceanbase.rpc.util.Serialization;
 import io.netty.buffer.ByteBuf;
 
@@ -184,4 +185,8 @@ protected int encodeHeader(byte[] bytes, int idx) {
         return idx;
     }
 
+    protected void encodeHeader(ObByteBuf buf) {
+        encodeObUniVersionHeader(buf, getVersion(), getPayloadContentSize());
+    }
+
 }