AR -> Use Lambda@Edge for API vanity url

[danieltruong]

At the moment, we are using a Cloudfront origin to redirect traffic going /api/ to our API Gateway. We want to use Lambda@Edge for this functionality.

Acceptance criteria:

• /api/ sends you to API Gateway via Lamda@Edge
• Update SAM template

Note:

• Refer to [L] DR -> Use Lambda@Edge for API vanity url parks-data-register#376
• Blocked by [XXL] Move A&R from Terraform to SAM #291

[danieltruong]

@Dianadec