[Feature][Transform] Add SimpleSQL transform plugin

[rewerma]

Purpose of this pull request

We can use simple SQL to transform input data. For example config:

transform {
  Sql {
    source_table_name = "fake"
    result_table_name = "fake1"
    query = "select id, concat(name, '_') as name, age+1 as age from fake where id>0"
  }
}

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.

[davidzollo]

The CI failed, please check and add license

[TaoZex]

Good Job!
Please add this feature in release-note.

[rewerma]

Good Job! Please add this feature in release-note.

ok

[Hisoka-X]

Hi, maybe change name SimpleSQL to SQL will be better. Clear, easy to understand.

[rewerma]

Hi, maybe change name SimpleSQL to SQL will be better. Clear, easy to understand.

The plugin name SQL is the same name as the old transform of Spark and Flink engine? Is the old SQL transform plugin removed？

[Hisoka-X]

Hi, maybe change name SimpleSQL to SQL will be better. Clear, easy to understand.

The plugin name SQL is the same name as the old transform of Spark and Flink engine? Is the old SQL transform plugin removed？

yes

[ashulin]

LGTM