### What problem does this PR solve?
Feat: Merge splitter and hierarchicalMerger into one node #9869
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Fix: The Context Generator node can only be followed by a Tokenizer and
a Context Generator. #9869
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Modify the background color of the canvas #9869
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Modify the default style of the agent node anchor #9869
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Fix: Fixed the issue where the operator added by clicking the plus sign
in the data flow would overlap with the original section #9886
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Feat: The agent's external page should be able to fill in the begin
parameter after being reset in task mode #9745
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Delete unused code in the data pipeline #9869
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Initialize the data pipeline canvas. #9869
### Type of change
- [x] New Feature (non-breaking change which adds functionality)