Should we need to extract the instance of file-datasource to a separate module？

## Issue Description

### Describe what happened (or what feature you want)

sentinel-datasource-extension should be the super module of datasource-extension who defining the rules of datasource, rules include some common classes or some interfaces or some abstract classes. But there are some datasource instance in this module like file-datasource. So I think we need to extract the instance of file-datasource to a separate module.

Start by reading the sentinel-datasource-extension and datasource-extension module definitions, then locate the file-datasource instances described in the issue. Done means the shared module contains only datasource rules and common abstractions, while the file-datasource implementation is provided by a separate module.

Written by the indexing model from the issue text.