refactor: add package version alias and update module exports

- Add `version` alias to import `_version` module
- Update `__all__` in factory module to use a tuple instead of list

src/sqlalchemy_dlock/__init__.py

@@ -2,6 +2,7 @@
 Distributed lock based on Database and SQLAlchemy
 """
 
+from . import _version as version
 from ._version import __version__, __version_tuple__
 from .exceptions import SqlAlchemyDLockBaseException, SqlAlchemyDLockDatabaseError
 from .factory import create_async_sadlock, create_sadlock

src/sqlalchemy_dlock/factory.py

@@ -7,7 +7,7 @@
 from .lock.base import AsyncConnT, BaseAsyncSadLock, BaseSadLock, ConnT
 from .registry import find_lock_class
 
-__all__ = ["create_sadlock", "create_async_sadlock"]
+__all__ = ("create_sadlock", "create_async_sadlock")
 
 
 KTV = TypeVar("KTV")