Add the ability to send a list of arns for the default domain policy

[mbradleySoftrams]

looking for a simple fix to allow the IaC to send a list of arns for the default policy, i had a branch with the change but unable to push to the repo.

here is the change i did locally

data "aws_iam_policy_document" "document" {
  count = var.enabled && var.enable_domain ? 1 : 0
  statement {
    actions   = ["SES:SendEmail", "SES:SendRawEmail"]
    resources = [aws_ses_domain_identity.default[0].arn]
    principals {
      identifiers = var.domain_policy_arns
      type        = "AWS"
    }
  }
}

and the new variable that defaults to the original value

variable "domain_policy_arns" {
  type        = list(string)
  default     = ["*"]
  description = "(Optional) A list of AWS arns allowed to send email through SES."
}