Quant in checkpoint dtype #2081

Job	Run time
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	26m 34s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	26m 18s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	18m 44s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	17m 10s
test-arm / test-backend-macos	0s
test-arm / package-golden-artifacts	48s
	1h 29m 34s

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