feat(connector): add template code for stripebilling

add a template code for stripe billing connector
<think>
PR Context:
- Title: feat(connector): add template code for stripebilling
- Merged: None
- Files changed: 30 files
- Commits: 2 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [x] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
connector integration template code for stripe billing.

Issue: This PR closes the issue #7212


### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

</think>

To implement this, you'll need to modify:


(No detailed commit information available)
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