client adapter同个instance配置多个group会共享CanalMsgConsumer，从而出现并发问题#5175
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问题现象：
kafka模式下同个instance配置多个group，启动必然会出现：KafkaConsumer is not safe for multi-threaded access Error sync and rollback的问题
原因：
每个group都会对应一个AdapterProcessor，AdapterProcessor初始化的时候会通过loader获取CanalMsgConsumer，CanalMsgConsumer实例会被ExtensionLoader缓存在EXTENSION_KEY_INSTANCE，key是name + "-" + key；而这里的key外部只会传入destination，所以导致同个instance多个group都会复用同一个CanalMsgConsumer，在kafka模式下就会出现多线程访问同一个kafkacomsumer的问题
解决方法：
传入destination + "-" + groupId作为key