### What problem does this PR solve?
issue:
https://github.com/infiniflow/ragflow/issues/10427
change:
new component variable assigner
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
new component:Data Operations
#10427
### Type of change
- [x] New Feature (non-breaking change which adds functionality)