Execute migrations in Postgres for greater context into rules

[froque]

• Execute migration files in a Testcontainers or io.zonky.test:embedded-postgres to get greater insights into if a SQL migration is safe or not.
• drop table rule #17 is an example of a migration that could benefit from context of the table to be dropped
• adding-field-with-default is another example that could benefit from further context
• changing-column-type is another example that could benefit from further context (checking pg_catalog.pg_cast)

Maybe add an option to disable for situations that the existing migration files don't represent 100% of the state of the database.

Open questions:

• What is the order to run the migrations ?