Add wasm32 support to the rust sdk (updated)

[kistz]

Description of Changes

Superscedes and is: #2704 so all credit goes to @thlsrms

This branch is updates to the latest master through cherry-picking leaving out the problematic switch to anymap3 thats currently holding back the pr.
All commit authorships are kept since i only rebased it :>
Since @thlsrms seems to be unavailbale right now i'd say we push this to finish line @gefjon ?

Testing

• @jkukatzki built a bevy integration and it works in the browser! Check out his Discord message

[jazzay]

I've been hoping #2704 would land a while ago, so if we could get this one across the line and into the 2.0.x release soon that would be much appreciated.

[kistz]

@jazzay its curerntly waiting on the ci which @bfops was experimenting with at some point.
Maybe he can chime in if its still on his radar/roadmap :>
(oh sry i was he already responded on another pr #4319 so maybe if i already pinged, you can answer whats your prefered strategy is for bringing this in? should i try to update my pr or close it in favor of the ai iuntested pr? im not super invested in this so i dont mind either way :> )

[bfops]

@jazzay its curerntly waiting on the ci which @bfops was experimenting with at some point. Maybe he can chime in if its still on his radar/roadmap :> (oh sry i was he already responded on another pr #4319 so maybe if i already pinged, you can answer whats your prefered strategy is for bringing this in? should i try to update my pr or close it in favor of the ai iuntested pr? im not super invested in this so i dont mind either way :> )

Good question. I still trust humans more than I do AI so if you think you're able to get it updated with latest master, I would appreciate that! Otherwise we can work with the other PR, I'm sure it's at least somewhat close.