[PR] [Mysql Pipline] Support mysql pipline rate limit [flink-cdc]

[via GitHub]

gaoyan1998 opened a new pull request, #3547:
URL: https://github.com/apache/flink-cdc/pull/3547

   This PR  Support  speed rate, 
   Prevent too much data in the initial stage from causing pressure downstream
   
   usage：
   ```yaml
   source:
     type: mysql
     ....
     ....
   sink:
     ...
     ....
   pipeline:
     name: Sync MySQL Database to Doris
     parallelism: 3
   # Limit the maximum number of data items per second on average
     rate.limit: 3
   ```


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