Add GEMM-based standard SDPA benchmark #1658

Job	Run time
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	25m 20s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	16m 51s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	17m 58s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	27m 17s
test-arm / test-backend-macos	0s
test-arm / package-golden-artifacts	46s
	1h 28m 12s

Provide feedback