[WIP ]Kinematic character controller

[AlaricBaraou]

TODO

This PR is meant to allow everyone to help in using the kinematic character controller of rapier https://rapier.rs/docs/user_guides/javascript/character_controller/

Depends on #701

wipKCC.mp4

This won't be fully working until Rapier fix this dimforge/rapier.js#291 and publish the fix to rapier.js
The current PR that fix the slope issue doesn't mention fixing the stairs issue.

For now using a capsule with the proper radius / velocity allow climbing some stairs, but this is not really controlled.

I'll probably stop the development on this until further progress is made on the rapier side.

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[AlaricBaraou]

A cube to illustrate more the stairs issue.

autoStepKCC.mp4