XRTK - Mixed Reality Toolkit Feature Request

Is your feature request related to a problem? Please describe

The hand tracking implementation of XRTK already calculates curl strength for each finger and hand. Those values are not used for visualization yet though.

It would be nice to give the user a visual cue when grabbing stuff and curling fingers.

Relevant classes:

`HandJointVisualizer

This needs to be implemented if we want to make some releases c:
https://electron.build

Describe the bug

Similarly to https://github.com/Tamschi/lignin-html/blob/471bb158f1348840947a8c81ec1acf1594c88b1a/src/lib.rs#L516-L588, which