Add @supports query for 3D transforms on carousel

Created by: MatthewRayfield

Addresses #15534 (closed)

Really just a Sass version of @cvrebert's v3 fix: https://github.com/twbs/bootstrap/commit/18e1bfa66250a4593cc36a9adb3b9231e5646f82

Explored using placeholder, but they don't behave well with @media/@supports queries. So a mixin was used.