### What problem does this PR solve?
feat: clear the selection box to delete the corresponding edge. #918
feat: fix the problem of form entries being deleted when adding a new
line #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: restrict classification operators cannot be connected to Answer
and other classification #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add delete menu to graph node #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add OperateDropdown
feat: send debug message #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add custom edge
feat: add flow card
feat: add store for canvas
#918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add FlowHeader and delete edge #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: test buildNodesAndEdgesFromDSLComponents #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: build react flow nodes and edges from mock data #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: handle operator drag
feat: add FlowCanvas
#592
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
