Alembic support for Trino

Describe the feature

It would be awesome to use Alembic for Trino in order to apply migrations and being able to rollback.
That can help with the CI/CD pipelines without overthinking an in-house solution when the technology is already in place.

Also, the Trino dialect is already implemented so it's a matter to connect the dots between the dialect and the Alembic usage (like the Imp for postgresql as example).

Describe alternatives you've considered

I have been able to use it with a workaround creating an empty implementation with the trino dialect but a proper implementation would be better and more functional:

from alembic.ddl.impl import DefaultImpl


class TrinoImpl(DefaultImpl):
    __dialect__ = 'trino'

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Start by reading the existing Trino dialect and Alembic's alembic/ddl/postgresql.py implementation, using DefaultImpl and the issue's empty TrinoImpl workaround as context. The work is complete when Alembic can apply and roll back migrations for Trino without the workaround; verify behavior against the project's available tests.