Remove invalid default parameters from KVStoreConfig and SqlStoreConfig
Annotated types which were causing UnsupportedFieldAttributeWarning and
producing incorrect string values instead of proper config objects.
Add proper default_factory to all KVStoreConfig and SqlStoreConfig fields
across core datatypes and provider configs, ensuring they instantiate
SqliteKVStoreConfig or SqliteSqlStoreConfig objects with correct defaults.
This improves usability by allowing configs to be instantiated without
explicitly providing storage configuration while maintaining type safety
and discriminated union functionality.
Signed-off-by: Charlie Doern <cdoern@redhat.com>