Infra configuration and deployments

[max-ostapenko]

Added Terraform config:

• Cloud Function: source + pubsub subscription + scheduler + IAM
• Dataform: repo + release config + IAM
• Monitoring
• Data Exchange

Repository workflows:

• apply terraform updates on push to main
• deploy Cloud Function on update

Closes #6

[max-ostapenko]

Will skip workflows for now. I'd like to check secure setup.
And IMHO it's already way easier to keep track of all the pieces with one command.