feat(): migrate to auth identity

src/template_project/adapters/data_gateways/auth_identity.py

@@ -0,0 +1,28 @@
+from typing import override
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from template_project.adapters.data_gateways.tables import auth_identity_table
+from template_project.application.auth_identity.data_gateway import AuthIdentityDataGateway
+from template_project.application.auth_identity.entity import AuthIdentity, AuthMethod
+from template_project.application.user.entity import UserId
+
+
+class DefaultAuthIdentityDataGateway(AuthIdentityDataGateway):
+    def __init__(self, session: AsyncSession) -> None:
+        self._session = session
+
+    @override
+    async def load_by_method_and_identifier(self, method: AuthMethod, identifier: str) -> AuthIdentity | None:
+        statement = select(AuthIdentity).where(
+            auth_identity_table.c.method == method, auth_identity_table.c.identifier == identifier
+        )
+        result = await self._session.execute(statement)
+        return result.scalar_one_or_none()
+
+    @override
+    async def load_all_for_user(self, user_id: UserId) -> list[AuthIdentity]:
+        statement = select(AuthIdentity).where(auth_identity_table.c.user_id == user_id)
+        result = await self._session.execute(statement)
+        return list(result.scalars().all())