Swap of popperjs with floating-ui

[dancormier]

Addresses https://github.com/StackExchange/Stacks/issues/872

This is very much a WIP.

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[b-kelly]

The changes floating-ui have made look really cool, so I'm excited to see the progress on this one. Moving to floating-ui is definitely the right path forward for us, eventually. It looks like it is still in the 0.x.x stages, but if it works and is stable for our uses, I don't see why that should hold us back.