[New feature] Support load files encoded in GBK format

Dear Development Team,

I am writing to express a specific requirement regarding the Streamloader tool. We hope that the Streamloader tool can support the import of files encoded in GBK format.

This functionality is crucial for our operations as a significant amount of data we handle is encoded in GBK. Enabling this support would greatly enhance our data processing capabilities and streamline our workflow.

Thank you for your attention to this matter. We look forward to the implementation of this feature.

Best regards