Manage API infrastructure with terraform

[mikesmit]

This issue is to track the work for putting the existing API infrastructure into terraform including

1. pre-production and production stages
2. support for (if not actually full implementation of) integration tests
   3 automatic deployment on change to executable or infrastructure code.

[mikesmit]

Did a basic demo of a way to arrange terraform based on terraform-google-project-factory here: https://github.com/mikesmit/cloudrun_tf_demo

[mikesmit]

Using the experience from doing that + feedback from Al, I am writing up a proposal for integrating terraform with our existing infrastructure in terraform design