Add `dbt test` for address consistency

[DistributedDoge]

Tests that make sure all addresses are stored in consistent, lowercase format.

• added generic test is_address_lowercase which should be applied to every address
• added make test which runs dbt test
• started working on schema description

Second commit modifies the dbt models to make sure tests actually pass.

Interesting side-effect is that calling make run (or selectively materializing asset for which test exists) will actually run tests as the final step, even though I did not touch any configuration.

[DistributedDoge]

Ready to merge., love the new CI.