[Feature][Sinker]Add pre_sql and post_sql for JDBC Sinker

[rewerma]

Purpose of this pull request

Add pre_sql and post_sql for JDBC Sinker, for example config:

sink {
  jdbc {
      source_table_name = "t_user"
      url = "jdbc:mysql://localhost:3306/test"
      driver = "com.mysql.cj.jdbc.Driver"
      user = "test"
      password = "test"
      pre_sql = ["truncate table t_user"]
      query = "insert into t_user(name,age) values(?,?)"
      post_sql = ["delete from t_user where age>150"]
  }
}

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/incubator-seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• Update the release-note.

[liugddx]

presql should be add in SeaTunnel Plugin LifeCycle#prepare

[rewerma]

The connection get from connectionProvider, it will be closed when JdbcSinkWriter close by the code:

outputFormat.close();

[liugddx]

The connection get from connectionProvider, it will be closed when JdbcSinkWriter close by the code:

outputFormat.close();

If the degree of parallelism is >1, does pre_sql need to be executed multiple times?

[rewerma]

The connection get from connectionProvider, it will be closed when JdbcSinkWriter close by the code:

outputFormat.close();

If the degree of parallelism is >1, does pre_sql need to be executed multiple times?

No, the method 'close' and 'open' of sinkWriter be called only once in the task life cycle.

[liugddx]

Please set execution.parallelism > 1

[XuankuF]

Excuse me, but why hasn't this PR been merged? Or how do I execute delete before sink?