Add support for Route53 private hosted zones

[jgerry]

Describe the solution you'd like.

It would be helpful to be able to use an internal Route53 zone in some situations.

Describe alternatives you've considered.

There's currently no way to do this. The the ALB module in use supports this feature, just need to replace internal = false in the ALB module call with a parameterized version. I've added a single new boolean variable route53_private_zone with a sane default of false, so any existing code will continue to work as it does now.

[antonbabenko]

This issue has been resolved in version 3.11.0 🎉

[github-actions]

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