support metadata_column

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.

### Description

-metadata_column is used to specify which metadata columns to include in the output schema of the connector. Metadata columns provide additional information related to the source data, such as the `table_name`, `database_name`, and `op_ts`.

### Use case
add argument
--metadata_column table_name \
--metadata_column database_name \
--metadata_column op_ts

_No response_

### Related issues

_No response_

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start by tracing how connector arguments are parsed and how the output schema is assembled. Check how metadata such as table_name, database_name, and op_ts is represented, then verify that repeated --metadata_column arguments include the requested columns in the connector output schema.

Written by the indexing model from the issue text.