DPLT-1084 Add Hasura CLI config

[morgsmccauley]

This PR adds the initial Hasura setup as config so that it can by deployed reproducibly when setting up new instances.

Typically, this config would be the source of truth for our Hasura instances, and tied to some CI pipeline to deploy it. But, this isn't feasible in our case since our config is dynamic (new indexers modify the metadata). For now, this config can be used for new instances of Hasura to ensure we have the desired initial setup.

To use this config, you'll need to have the Hasura CLI installed and cd in to the hasura/ directory. There are two main pieces to this config:

• metadata - defines what databases exists, which tables are tracked, and their associated permissions
• migration - defines the DB schema, and its evolution

It's a bit weird that we have both the hasura/ and hasura-authentication-service directories, I might end up moving auth under hasura/ in a future PR.