refactor(api): refactor all

- Replaced direct imports of `TriggerProviderID` and `ToolProviderID` from `core.plugin.entities.plugin` with imports from `models.provider_ids` for better organization.
- Refactored workflow node classes to inherit from a unified `Node` class, improving consistency and maintainability.
- Removed unused code and comments to clean up the implementation, particularly in the `workflow_trigger.py` and `builtin_tools_manage_service.py` files.

These changes enhance the clarity and structure of the codebase, facilitating easier future modifications.

api/models/provider_ids.py

@@ -57,3 +57,8 @@ class ToolProviderID(GenericProviderID):
 class DatasourceProviderID(GenericProviderID):
     def __init__(self, value: str, is_hardcoded: bool = False) -> None:
         super().__init__(value, is_hardcoded)
+
+
+class TriggerProviderID(GenericProviderID):
+    def __init__(self, value: str, is_hardcoded: bool = False) -> None:
+        super().__init__(value, is_hardcoded)