Add fused GatedDeltaNet decode Triton kernel #3469

Job	Run time
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	19m 21s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	31m 30s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	31m 21s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	16m 37s
test-arm / test-backend-macos	0s
test-arm / package-golden-artifacts	49s
	1h 39m 38s

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