Make tool type optional in the base class

Author: Val Brodsky

libs/labelbox/src/labelbox/schema/tool_building/base_step_reasoning_tool.py

@@ -70,8 +70,8 @@ def from_dict(cls, dictionary: Dict[str, Any]) -> "_Definition":
 @dataclass
 class _BaseStepReasoningTool:
     name: str
-    type: ToolType
     definition: _Definition
+    type: Optional[ToolType] = None
     schema_id: Optional[str] = None
     feature_schema_id: Optional[str] = None
     color: Optional[str] = None