feat: Add single_nat_gateway_subnet_index to choose NAT Gateway public subnet #582

Job	Run time
Collect workflow inputs	4s
Max TF pre-commit	1m 8s
Min TF pre-commit (.)	21s
Min TF pre-commit (./modules/vpc-endpoints)	21s
Min TF pre-commit (./examples/outpost)	25s
Min TF pre-commit (./examples/complete)	22s
Min TF pre-commit (./examples/simple)	21s
Min TF pre-commit (./examples/secondary-cidr-blocks)	22s
Min TF pre-commit (./examples/separate-route-tables)	25s
Min TF pre-commit (./examples/ipv6-dualstack)	24s
Min TF pre-commit (./examples/network-acls)	21s
Min TF pre-commit (./examples/manage-default-vpc)	20s
Min TF pre-commit (./examples/ipv6-only)	23s
Min TF pre-commit (./examples/vpc-flow-logs)	22s
Min TF pre-commit (./examples/issues)	23s
Min TF pre-commit (./examples/ipam)	22s
	6m 24s

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