Testservices

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- Default Postgres SQLAlchemy dialect to psycopg3

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- Strictly type checked with `mypy`.

- Re-worked interfaces for :class:`~testservices.service.Service` and
:class:`~testservices.provider.Provider`.

- Re-worked container services.

- Beginnings of API documentation.

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.. py:currentmodule:: testservices.services.databases

- Make it clear that for :class:`DatabaseFromEnvironment` to check a port is up,
the port must be specified.

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- Fix bug when no port was specified in a :class:`DatabaseFromEnvironment` url.

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- Add :class:`DatabaseFromEnvironment` service.

- :class:`~testservices.provider.Provider` can now be used to choose the first available
:class:`~testservices.service.Service` that provides an instance.

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- Initial release featuring simple container services with helpers for common databases.