Protobuf support: Add license header

Signed-off-by: zhouzh_zzz <zhouzh_zzz@qq.com>

redisson/src/main/java/org/redisson/codec/ProtobufCodec.java

@@ -1,3 +1,18 @@
+/**
+ * Copyright (c) 2023 zhouzh_zzz
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.redisson.codec;
 
 import com.fasterxml.jackson.databind.cfg.SerializerFactoryConfig;