[Feature][Connector V2] expose configurable options in IoTDB

[john8628]

Purpose of this pull request

https://github.com/apache/incubator-seatunnel/issues/3386

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

[hailin0]

@john8628 Add if null check to IoTDBSourceReader#close

[john8628]

@john8628 Add if null check to IoTDBSourceReader#close

OK ;

[hailin0]

using conf.get(xxx.getKey()) of all options

https://github.com/apache/incubator-seatunnel/actions/runs/3480966388/jobs/5821511988