Hide output by default (tab checkbox)

[felixsanz]

Hi there! First of all thanks for creating such an awesome project!

I have a tab where I only run long lived processes, and I don't care about the output. So when I start the processes I'm just clicking on all the "hide output" so the block doesn't take much space and I can see all the blocks without scrolling.

Would be great if, inside the tab configuration (where you set name, icon, tab color, etc), there is an option like "Hide output of blocks by default".

Is this a nice feature to add? wdyt?