fix(datasource): Correct the import path for StarRocks dialect

[vnicers]

Description

fix #2453
Version 0.7.0 changes the code package structure, and the path to register the database dialect changes and needs to be changed

How Has This Been Tested?

make fmt
make mypy
make test

Snapshots:

Checklist:

• [x ] My code follows the style guidelines of this project
• I have already rebased the commits and make the commit message conform to the project standard.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Any dependent changes have been merged and published in downstream modules

[fangyinc]

LGTM.

Thank you for your contribution. Let's build together and make DB-GPT better.

[Aries-ckt]

LGTM