[Feature Request]: generic data load bridge may need a Register/UnregisterDataSource method.

### Is there an existing issue for the same feature request?

- [x] I have checked the existing issues.

### Is your feature request related to a problem?

```Markdown
A generic data loader, roughly mirror gpfdist. First candidate should bridge all java ecosystem.
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### Describe the feature you'd like

An external table. Roughly mirror the gpfdist.

### Describe implementation you've considered

_No response_

### Documentation, Adoption, Use Case, Migration Strategy

```Markdown

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### Additional information

_No response_