Use torch._grouped_mm in eager mode #9833

Job	Run time
check-schema / schema	14s
check-package / pkg-build (ubuntu-latest)	27s
check-package / merge-artifacts	11s
check-package / pkg-check (ubuntu-latest, 3.11)	3m 9s
check-package / pkg-check (ubuntu-latest, 3.10)	3m 14s
check-package / pkg-check (macOS-latest, 3.10)	1m 35s
check-package / pkg-check (windows-latest, 3.11)	2m 50s
check-package / pkg-check (windows-latest, 3.10)	2m 29s
check-package / pkg-check (macOS-latest, 3.11)	59s
check-package / pkg-guardian	4s
	15m 12s

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