[WebGPU] Integrate Metal-cpp
Pull request: https://github.com/WebKit/WebKit/pull/869
*** This bug has been marked as a duplicate of bug 236697 ***
Committed r294599 (250827@main): <https://commits.webkit.org/250827@main> Reviewed commits have been landed. Closing PR #869 and removing active labels.
<rdar://problem/93687158>