feat(types): add __all__ exports for password hashing backends (#471)

This update adds `__all__` exports for the Argon2, Passlib, and Pwdlib hashing backends, improving module visibility and usability.

Author: cofin

advanced_alchemy/types/password_hash/argon2.py

@@ -10,6 +10,8 @@
 from argon2 import PasswordHasher as Argon2PasswordHasher  # pyright: ignore
 from argon2.exceptions import InvalidHash, VerifyMismatchError  # pyright: ignore
 
+__all__ = ("Argon2Hasher",)
+
 
 class Argon2Hasher(HashingBackend):
     """Hashing backend using Argon2 via the argon2-cffi library."""

advanced_alchemy/types/password_hash/passlib.py

@@ -9,6 +9,8 @@
 if TYPE_CHECKING:
     from sqlalchemy import BinaryExpression, ColumnElement
 
+__all__ = ("PasslibHasher",)
+
 
 class PasslibHasher(HashingBackend):
     """Hashing backend using Passlib.

advanced_alchemy/types/password_hash/pwdlib.py

@@ -9,6 +9,8 @@
 
 from pwdlib.hashers.base import HasherProtocol
 
+__all__ = ("PwdlibHasher",)
+
 
 class PwdlibHasher(HashingBackend):
     """Hashing backend using Pwdlib."""