issue/234 - Add edge function for signing and Host header replacement

[huntharo]

• Fixes Next - CDK - Sign Requests to Origin Option #234
• Status 05/21
  • Edge function is deployed to us-east-1 no matter where the origin stack is deployed
  • Execute privs are granted via a resource tag condition to avoid a circular ref between the edge and origin stacks
  • The CDK stack is not enabling IAM auth on the HTTP API for some reason
  • awscurl command works against the API Gateway endpoint when IAM is manually enabled
  • The CloudFront Edge function signed requests are rejected with:
    • 403: "The request for the IAM Authorizer doesn't match the format that API Gateway expects."
  • The Deployer function needs to set the IAM auth on app and version routes when enabled
  • The config.yml file is getting copied into the Edge Lambda code
  • The Edge Lambda code contains extraneous files - Need to build into a different directory
    • Will address later - not super important