Add database migration to enable pgcrypto

[rocketnova]

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Changes

What was added, updated, or removed in this PR.

• Add database migration to enable pgcrypto postgresql extension

Context for reviewers

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Using UUIDs with Postgresql requires the Postgresql extension pgcrypto to generate random UUIDs. This PR adds a database migration to enable the extension.

Note: Depending on deployment and hosting, this may be an extension that requires elevated privileges to enable. That's the case when deploying with AWS. I will be noting that in the forthcoming PR documenting integration with the Nava Platform infrastructure template.

Testing

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Before the migration:

After the migration:

After rollback:

[rocketnova]

LGTM - seems like something we should add to the accelerator repo if we have time?

👍 It's already in the accelerator repo. I missed it in the port to the rails template.