Import OutageStatusValue in __init__.py

Handle imports for OutageStatusValue in the same way as StatusValue.

I tested this locally, seems to work

src/sfapi_client/__init__.py

@@ -1,5 +1,6 @@
 from .client import AsyncClient  # noqa: F401
 from .client import Client  # noqa: F401
 from .exceptions import SfApiError  # noqa: F401
+from ._models import OutageStatusValue  # noqa: F401
 from ._models import StatusValue  # noqa: F401
 from ._models.resources import Resource  # noqa: F401