Process CSV files and create new columns of data using AI

[Tim]

1. The problem

eg Process list of CSV products, generate some AI descriptions, etc

2. Simple solution

Re-use csv merge tool and ugprade it to also add AI data

[bukit]

+1 this this feature

[Tim]

Devlog

Some test ui code to add extra ai driven cols

CSV export section showing newly added cols

[Tim]

The AI cols is now ready for testing