Add tracer autoconfigure. (#847)

[it-linnan]

为 SOFATracer 中的 plugin 增加 SOFABoot auto-configuration

fix #847

以下plugin的autoconfigure，是从SOFATracer 3.1.0版本的starter中抽取了相关代码，同步过来的。

• KafkaMQ
• RabbitMQ
• SpringMessage
• Redis

MongoDB plugin 的autoconfigure

前提：SOFATracer基于MongoDB 3.8.2版本的驱动实现，而当前版本SOFABoot依赖MongoDB 4.0.5版本驱动。因此，需基于当前版本驱动的MongoClient和MongoAutoConfiguration实现自动配置。

实现思路：注册自定义MongoClientSettingsBuilderCustomizerbean，向MongoDB client的配置类中增加SofaTracerCommandListener。

RocketMQ plugin 的autoconfigure

1. 添加了可选依赖rocketmq-spring-boot-starter
2. 注册BeanPostProcessor，在producer和consumer初始化后，添加MessageHook

[codecov[bot]]

Codecov Report

Merging #875 (d26c33e) into master (d7f4dc1) will decrease coverage by 0.12%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #875      +/-   ##
============================================
- Coverage     11.38%   11.25%   -0.13%     
  Complexity       41       41              
============================================
  Files           312      325      +13     
  Lines          9207     9310     +103     
  Branches       1270     1275       +5     
============================================
  Hits           1048     1048              
- Misses         8001     8104     +103     
  Partials        158      158              

Impacted Files	Coverage Δ
...igure/tracer/SofaTracerKafkaAutoConfiguration.java	0.00% <0.00%> (ø)
...igure/tracer/SofaTracerMongoAutoConfiguration.java	0.00% <0.00%> (ø)
...re/tracer/SofaTracerRabbitMqAutoConfiguration.java	0.00% <0.00%> (ø)
...igure/tracer/SofaTracerRedisAutoConfiguration.java	0.00% <0.00%> (ø)
...re/tracer/SofaTracerRocketMqAutoConfiguration.java	0.00% <0.00%> (ø)
...nfigure/tracer/SpringMessageAutoConfiguration.java	0.00% <0.00%> (ø)
...a/processor/KafkaConsumerFactoryPostProcessor.java	0.00% <0.00%> (ø)
...a/processor/KafkaProducerFactoryPostProcessor.java	0.00% <0.00%> (ø)
...ocessor/StreamRocketMQTracerBeanPostProcessor.java	0.00% <0.00%> (ø)
...ofaTracerMongoClientSettingsBuilderCustomizer.java	0.00% <0.00%> (ø)
... and 3 more

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[alaneuler]

@it-linnan 还有一个问题，原先 tracer 代码中的 @author 标签不对（后边没有冒号的），也辛苦改一下。

review 有点慢，还请见谅～

[alaneuler]

@it-linnan 感谢贡献代码～ mongodb 和 rocketmq 的基础 processor 可以提供一下测试用例吗？

[it-linnan]

@it-linnan 感谢贡献代码～ mongodb 和 rocketmq 的基础 processor 可以提供一下测试用例吗？

好的，我写一下测试用例

[it-linnan]

@alaneuler 测试用例已提交，麻烦review下，辛苦~