[ISSUE #713]add logstash-output-rocketmq java plugin

[PatrickkZ]

What is the purpose of the change

add a logstash-output-rocketmq java plugin

Brief changelog

XX

Verifying this change

XXXX

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[vongosling]

see https://github.com/apache/rocketmq-externals/pull/722

[RongtongJin]

Hi, @vongosling，this is a topic of cooperation with universities, so different students will submit logstash related PR for the rocketmq community. We can help review the code and help them merge if they meet the standards.

[vongosling]

You could label this topic as homework@RongtongJin . and pls follow other pr topics([ISSUES #issue number]). This is the first correct step for your participation. @PatrickkZ

[githublaohu]

1. 麻烦提供下 如果验证这个插件
2. 麻烦，说下一些配置文件的作用
   1. 是否能提供下 maven的构建方式，目前整个rocketmq都是maven构建的。
3. 麻烦优化功能与结构
4. 麻烦在文件里面，写入apache 2.0协议头

[githublaohu]

按照README.md 文档里面的说明，构建项目失败。 `

Task :compileJava /leaning/space-work/java-study/rocketmq-externals/logstash-output-rocketmq/src/main/java/org/logstashplugins/RocketMQ.java:3: 错误: 程序包co.elastic.logstash.api不存在 import co.elastic.logstash.api.Configuration; `

logstash-api这个依赖找不到

[githublaohu]

@PatrickkZ 你好，如果看下消息或者邮件，麻烦回复下。我会协助你完成这个pr。