WebGPURenderer: Implement GGX VNDF importance sampling for PMREM#32134

mrdoob merged 13 commits intodevmrdoob/three.js:devfrom

claude/session-011CUZfd82vQUmMrBBmDS1CQmrdoob/three.js:claude/session-011CUZfd82vQUmMrBBmDS1CQCopy head branch name to clipboard