[Fix] Fix Oracle type converter handle negative scale in number type

[Hisoka-X]

Purpose of this pull request

This PR fix the behavior of Oracle type converter handle negative scale in number type. Refer https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/Data-Types.html#GUID-9401BC04-81C4-4CD5-99E7-C5E25C83F608

Does this PR introduce any user-facing change?

no

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 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.