Use custom hands model with the Hands component

[AlaricBaraou]

This PR should allow user to load their own models when using the <Hands /> component.

They can specify a model for the left or right hands individually like so :

<Hands
      modelLeft={"https://vazxmixjsiawhamofees.supabase.co/storage/v1/object/public/models/left-hand-black-webxr-tracking-ready/model.gltf"}
      modelRight={"https://vazxmixjsiawhamofees.supabase.co/storage/v1/object/public/models/right-hand-black-webxr-tracking-ready/model.gltf"}
/>

If no model are specified it will load the current model.

Let me know if you want me to code it differently / rename stuff etc.

Once it's merged, I'll try to make a simple demo of it and add it to the readme and getting started.

( Also, can we rename src\webxr\HandModel.js to something else ? Maybe I'm missing why it's called Oculus, because I don't see why it's specific to Oculus )

Thank you in advance !

[sniok]

Nice! Also would be nice to add some documentation to readme or I can do it later

[sniok]

and yeah it can be renamed to just HandModel, there's nothing 'oculus' about it

[sniok]

once we merge this and #63 we can do a "Hand" release :D

[AlaricBaraou]

I was thinking of a demo where you can change your hands dynamically but the way it's currently done it wouldn't work.

Would it be worth to make this dynamic ?

I can see some use cases but there is not a lot of them.

[sniok]

we can keep it simple for now and add dynamic loading later