Support Background Processing of Notebook Cells in Linea

[moustafa-a]

This is based on feedback from antingshen

Is your feature request related to a problem? Please describe.
I have a cell in my notebook doing query/processing that was projected to take 2 hours. I wanted to develop other stuff in my notebook while waiting for it to finish but I could only run one cell at a time. Normally I'd either have to move the cells for the long query to another notebook or move the cells for my next experiment to another notebook and combine them later.

Describe the solution you'd like
Can Linea get the code for my query calculation and put it into a separate Python file and run it or execute that cell in the background.