Migrate to Terraform 1.0 / AWS 3.39+

[jonnyzzz]

This is a helpful module. Would be nice to have it migrated to the actual Terraform/AWS plugin.

It uses a slightly different syntax, e.g.:

resource "aws_acm_certificate" "api" {
  domain_name               = var.public_dns
  subject_alternative_names = []
  validation_method         = "DNS"

  tags = {
    Name    = "${local.prefix}"
    stack = local.stack
  }

  provider = aws.api_gateway
}

resource "aws_route53_record" "proof" {
  for_each = {
    for dvo in aws_acm_certificate.api.domain_validation_options : dvo.domain_name => {
      name   = dvo.resource_record_name
      record = dvo.resource_record_value
      type   = dvo.resource_record_type
    }
  }

  allow_overwrite = true
  name            = each.value.name
  records         = [each.value.record]
  ttl             = 60
  type            = each.value.type
  zone_id         = data.aws_route53_zone.api.zone_id
}

resource "aws_acm_certificate_validation" "api" {
  certificate_arn         = aws_acm_certificate.api.arn
  validation_record_fqdns =  [for record in aws_route53_record.proof : record.fqdn]
  provider = aws.api_gateway
}