Ensure tags are defined for AWS NAT Gateways

Defining Tags for resources ensures that resources are maintained and tracked effectively.

In AWS Console -

1. Sign in to the AWS Console.
2. Open NAT Gateways in the AWS VPC console.
3. Move the cursor to the name field and select edit button.
4. Enter a name for your tag.

In Terraform -

1. In the aws_nat_gateway resource, configure tags accordingly.

References:
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/nat_gateway#tags