Enhancement: Improve Assigns section performance

[GuzekAlan]

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[GuzekAlan]

In this PR an E2E test with search in assigns fails. Currently due to optimalization search in assigns doesn't work properly but I will fix it in other PR since this one is big enough

[hhubert6]

🐬 Amazing work 🐬

When assigns are really big the time required for render and update can take couple of seconds and It would be nice to have a loader indicating that the assigns are being updated

Also when testing on very big assigns html updates become increasingly longer but seems like it might be due to calculating assigns sizes (When I comment out displaying sizes it helps a lot). It's probably for another pr.

[GuzekAlan]

@hhubert6

When assigns are really big the time required for render and update can take couple of seconds and It would be nice to have a loader indicating that the assigns are being updated

I think it is a good idea. What do you think about making gray overlay and not allowing user to interact when the UI is rendering? I would like to do i in separate PR since it's not crucial and some task are dependant on this one. ( #808 )

Also when testing on very big assigns html updates become increasingly longer but seems like it might be due to calculating assigns sizes (When I comment out displaying sizes it helps a lot). It's probably for another pr.

I've added sending big messages to dev to better show this case. I'll create task for running assigns size calculations in the background ( #807 )