Add MPEG_haptic and MPEG_haptic_material extensions

[haudiobe]

MPEG added this extension in the second edition that is currently under FDIS ballot.

We submitted information to Khronos in an LS to explain details.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
0 out of 3 committers have signed the CLA.

❌ ibouazizi
❌ haudiobe
❌ lelievres
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