[Improve][JDBC Source] Fix Split can not be cancel

[EricJoy2048]

Purpose of this pull request

Solve the problem of job being unable to be savepoint and cancelled during split chunk.

Does this PR introduce any user-facing change?

No.

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.

[hailin0]

Need to change this?

seatunnel/seatunnel-connectors-v2/connector-cdc/connector-cdc-base/src/main/java/org/apache/seatunnel/connectors/cdc/base/source/enumerator/splitter/JdbcSourceChunkSplitter.java

Line 101 in 329b849

return sampleDataFromColumn(jdbc, tableId, column.name(), samplingRate);

[EricJoy2048]

done, added

[hailin0]

LGTM