…e connecting line (#9226)
### What problem does this PR solve?
Can directly generate an agent node by dragging and dropping the
connecting line (#9226)
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
