Support external domains

[andig]

Describe the Feature

Currently, this module tries to configure route53. It would be nice if I could use it with domains that are not controlled by AWS.

Expected Behavior

A clear and concise description of what you expected to happen.

Use Case

Domain is already configured outside of AWS. Leaving domain out of the config is not possible:

Error: Missing required argument

  on main.tf line 20, in module "ses_lambda_forwarder":
  20: module "ses_lambda_forwarder" {

The argument "domain" is required, but no definition was found.

Describe Ideal Solution

A clear and concise description of what you want to happen. If you don't know, that's okay.

Alternatives Considered

n/a