模块化mq connector

[rewerma]

新增connector模块，以spi的方式独立加载kafka、RabbitMQ、RocketMQ等mq producer。可自定义connector连接其它mq

[codecov-io]

Codecov Report

Merging #2562 into master will decrease coverage by 0.13%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##             master   #2562      +/-   ##
===========================================
- Coverage      4.89%   4.76%   -0.14%     
  Complexity      239     239              
===========================================
  Files           366     392      +26     
  Lines         34604   35588     +984     
  Branches       5381    5546     +165     
===========================================
  Hits           1694    1694              
- Misses        32661   33645     +984     
  Partials        249     249

Impacted Files	Coverage Δ	Complexity Δ
...nnector/kafka/producer/KafkaMessageSerializer.java	0% <ø> (ø)	0 <0> (?)
...r/rabbitmq/producer/AliyunCredentialsProvider.java	0% <ø> (ø)	0 <0> (?)
...er/canal/connector/core/config/CanalConstants.java	0% <0%> (ø)	0 <0> (?)
.../otter/canal/connector/core/util/JdbcTypeUtil.java	0% <0%> (ø)	0 <0> (?)
...baba/otter/canal/connector/core/util/TimeZone.java	0% <0%> (ø)	0 <0> (?)
.../canal/connector/core/producer/MQMessageUtils.java	0% <0%> (ø)	0 <0> (?)
...r/canal/connector/kafka/config/KafkaConstants.java	0% <0%> (ø)	0 <0> (?)
...a/otter/canal/connector/core/util/MessageUtil.java	0% <0%> (ø)	0 <0> (?)
...nector/rocketmq/config/RocketMQProducerConfig.java	0% <0%> (ø)	0 <0> (?)
...al/connector/core/producer/AbstractMQProducer.java	0% <0%> (ø)	0 <0> (?)
... and 58 more

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[agapple]

非常赞哈，给后续扩展更多的MQ提供了基础