[Improve][Connector-V2] Improve jdbc merge table from path and query when type is decimal

[Hisoka-X]

Purpose of this pull request

In jdbc merge table from table path and table query, when column type is decimal, the precision and scale should not affect the merge result.

Does this PR introduce any user-facing change?

Yes, some source produce catalog table type could be changed. But it should be OK, it is more accurate.

How was this patch tested?

add new test.

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 plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• [ ] Update the release-note.