[FEAT] Add Metal backend CI #536

Job	Run time
Check Spelling	12s
check-changed-files / Check Changed Files	9s
extract-cuda-backend-branch / Extract branch name	7s
extract-metal-backend-branch / Extract branch name	5s
Check Code Format	41s
Test ring on Linux (labrador)	1s
Test field on Linux (babybear, -DEXT_FIELD=ON)	1s
Run Rust Examples	1s
Test field on Linux (stark252, -DEXT_FIELD=OFF)	1s
Test field on Linux (m31, -DEXT_FIELD=ON)	1s
Test Curve bn254 on Linux with cuda	1s
Build and test Go & RUST hash on Linux	1s
Test field on Linux (koalabear, -DEXT_FIELD=ON)	1s
Test Curve bls12_381 on Linux with cuda	1s
Test Curve bls12_377 on Linux with cuda	1s
Test Curve bw6_761 on Linux with cuda	1s
Test Curve grumpkin on Linux with cuda	1s
Test Curve bn254 on macOS with metal	1s
Test Curve bls12_381 on macOS with metal	1s
Test Curve bls12_377 on macOS with metal	1s
Test Curve bw6_761 on macOS with metal	1s
Test Curve grumpkin on macOS with metal	1s
	1m 31s

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