tfblocks: small utility for working with Terraform migrations

If you haven’t been around the block (heh) in a while, you might’ve missed the introduction of the moved (Dec ‘21), import (Jun ‘23) and more recently removed (Jan ‘24) blocks in Terraform. They have been great quality-of-life improvements that simplify refactoring and migrating Terraform code, and allow you to change resource names, import existing resources into your state, and remove resources…