[Improve][Doris Connector] Unified serialization method,Use RowToJsonConverter and TextSerializationSchema

[liugddx]

Purpose of this pull request

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• [ ] 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/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]

After https://github.com/apache/doris/issues/38174 is resolved, I will upgrade to the latest doris version as a image for test cases.

[Hisoka-X]

After apache/doris#38174 is resolved, I will upgrade to the latest doris version as a image for test cases.

Please create an issue for this.