Refactor VirtualList to typescript

[mifi]

This reverts commit 5d331b9.

(cherry picked from commit 4f7e7d9)

Recreated #5255 because that one became messed up after google drive merge to main

TODO

• VirtualList seems to be broken (fix it) Revert "reverse virtuallist refactor" #5255 (comment) (see also UI slowness at many files (10k) #4679)

[github-actions]

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[aduh95]

This is not our code, we're never going to upstream this change, so is this a good idea? If we want types, we could vendor https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/preact-virtual-list/index.d.ts

[lakesare]

@aduh95, the original library has last been updated 8 years ago, we're effectively on our own now.
Also - we tweaked it many times already, even the initial Renee's commit included tweaks.

I'm pro refactoring it into typescript & treating it like our own code.

[mifi]

i'm open to switching to some module to do list virtualization, like for example https://tanstack.com/virtual/latest - however if we'ere going to instead keep our own implementation I think we should indeed refactor it to typescript

[lakesare]

To be clear about my pending review - I'll review it when the performance part of this this PR ("VirtualList seems to be broken (fix it)") is implemented