ROCKETMQ-157: Serializer&Deserializer support for RocketMQ

[vesense]

What is the purpose of the change

RocketMQ-Serializer is a RocketMQ extend library for serializing and deserializing message body.
Both APIs and implements(string, json, avro...) are included in this module.
https://issues.apache.org/jira/browse/ROCKETMQ-157

Brief changelog

APIs

The core serializer & deserializer API are interfaces RocketMQSerializer and RocketMQDeserializer.
In order to centralized manage avro schemas, you can implement SchemaRegistry interface in rocketmq-serializer-avro module,
and use SchemaRegistry registering and getting schemas.

Implementations

Supported Formats

Format	Serializer	Deserializer
Raw String	Y	Y
JSON	Y	Y
Avro Generic	Y	Y
Avro Specified	Y	Y

Some serializer performance research please refer to https://github.com/vongosling/jvm-serializer.

User Defined Formats

You can define your format just implements RocketMQSerializer and RocketMQDeserializer.

Tools

Messages provides methods like newMessage and getMessageBody to map between user class and byte array.
AvroUtils provides methods newGenericRecord and newSchema to create avro records and schemas.

Internals

rocketmq-serializer-avro is powered by Apache Avro, and rocketmq-serializer-json is powered by fastjson.

Verifying this change

unit tests check passed ✅
apache-rat check passed ✅
checkstyle check passed ✅

[vesense]

@vongosling @zhouxinyu Do yo have time to take a look?

[vesense]

@vongosling @zhouxinyu ping..

[vesense]

Any comments are welcome..

[vesense]

Upgraded RocketMQ version to 4.2.0 and removed author infos.
@vongosling @zhouxinyu Can you guys take a look?

[vongosling]

Actually, I have trouble fully understanding the project real purpose, do you want to support some serializers for send method in RocketMQ ?

[vesense]

@vongosling This is a tool library for serializing / deserializing message body.
It provides convenient API for users whatever sending or receiving messages.

[vesense]

@vongosling e.g.

[vesense]

@vongosling Do I make it clear?

[vongosling]

yes, I will merge your request, thanks