Publish terraform geth pool and indexer builder to terraform registry

[habdelra]

In order to share with the world a faster means of setting up an ethereum index for the cardstack hub, publish the terraform modules that we leverage for the ethereum index builder and its associated geth pool to the terraform registry. Use our current ethereum module as a template: https://github.com/cardstack/terraform-aws-ethereum-node. Instructions for publishing to the terraform registry are here: https://www.terraform.io/docs/registry/modules/publish.html

Also, it might not be a bad idea to export populated index to a CSV file for developers that don't have the means to spin up an index builder in AWS.