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/core/plugin/entities/plugin.py

@@ -1,7 +1,7 @@
 import datetime
 from collections.abc import Mapping
 from enum import StrEnum, auto
-from typing import Any
+from typing import Any, Optional
 
 from packaging.version import InvalidVersion, Version
 from pydantic import BaseModel, Field, field_validator, model_validator