fix: Fix bug with no SqlRegistryConfig class (feast-dev#3586)

* adding SqlRegistryConfig class

Signed-off-by: davidschuler-8451 <david.schuler@8451.com>

* refactor: move SqlRegistryConfig class to sql.py

Signed-off-by: davidschuler-8451 <david.schuler@8451.com>

* enabling SqlRegistry to accept RegistryConfig or SqlRegistryConfig

Signed-off-by: davidschuler-8451 <david.schuler@8451.com>

---------

Signed-off-by: davidschuler-8451 <david.schuler@8451.com>

Author: davidschuler-8451

sdk/python/feast/infra/registry/sql.py

@@ -5,6 +5,7 @@
 from threading import Lock
 from typing import Any, Callable, List, Optional, Set, Union
 
+from pydantic import StrictStr
 from sqlalchemy import (  # type: ignore
     BigInteger,
     Column,
@@ -178,10 +179,19 @@ class FeastMetadataKeys(Enum):
 )
 
 
+class SqlRegistryConfig(RegistryConfig):
+    registry_type: StrictStr = "sql"
+    """ str: Provider name or a class name that implements Registry."""
+
+    path: StrictStr = ""
+    """ str: Path to metadata store.
+    If registry_type is 'sql', then this is a database URL as expected by SQLAlchemy """
+
+
 class SqlRegistry(BaseRegistry):
     def __init__(
         self,
-        registry_config: Optional[RegistryConfig],
+        registry_config: Optional[Union[RegistryConfig, SqlRegistryConfig]],
         project: str,
         repo_path: Optional[Path],
     ):