Support multiple engines and sessionmakers

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[Copilot]

Pull request overview

This PR updates pytest-sqlalchemy-alembic to support configuring multiple SQLAlchemy engine/sessionmaker setups via a new sqlalchemy_alembic_configs list, replacing the prior single-value ini options.

Changes:

• Replaced single ini settings with a sqlalchemy_alembic_configs linelist and added parsing/validation for per-entry config objects.
• Updated plugin setup fixtures to iterate over multiple configs and manage multiple test engines in one session.
• Updated tests and documentation/examples to use the new configuration format.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/pytest_sqlalchemy_alembic/utils.py	Adds a dataclass helper intended for runtime type-checking of config entries.
src/pytest_sqlalchemy_alembic/config.py	Introduces sqlalchemy_alembic_configs parsing and PluginConfig.build_list() to produce multiple configs.
src/pytest_sqlalchemy_alembic/plugin.py	Updates pytest integration/fixtures to setup multiple engines and optional DB management per config.
src/pytest_sqlalchemy_alembic/tests/test_plugin.py	Adjusts tests to the new ini format and adds coverage for empty/under-configured entries.
README.md	Documents the new sqlalchemy_alembic_configs format and updated fixture/config usage.
example_project/pytest.ini	Adds example ini configuration using the new configs list.
example_project/pyproject.toml	Removes old ini option usage from the example project.
example_project_async/pyproject.toml	Updates async example to use the new configs list.

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