Describe your changes

Change the interface of the data-loading node from using a code editor to choosing a .txt/.json file in the local library. In the new interface, there are two buttons: Uploading file and Load Data. Code editor was removed from the interface, but still keep for further need.

Issue resolved by this PR (if any)

• Issue Number:
• Link:

Type of change (Check all that apply)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Other:

Parts of Curio impacted by this PR:

• Frontend
• Backend
• Sandbox

Testing

• Unit Tests
• Manual Testing (please provide details below):

Screenshots (if relevant)

Example of new interface

Checklist (Check all that apply)

• I have manually loaded each .json test from the tests/ folder into Curio, ran all the nodes one by one, and checked that they run without errors and give the expected results (in case all data files are converted to .txt before processing)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules