Add jdbc connector e2e test

[zhangyuge1]

Purpose of this pull request

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

[CalvinKirs]

#2255 . License it's ok. I will take a look when my free.

[ic4y]

@zhangyuge1 Thank you for your contribution.

At present, only batch tests are covered, Streaming Mode and Exactly-Once Streaming Mode are not covered。Can you add these two test scenarios? And abstract public methods for use by mysql, pgsql, and dmsql . . .