feat(skill): tool switcher implementation

- Introduced a new regex pattern for tool groups to support multiple tool placeholders.
- Updated the DefaultToolResolver to format outputs for specific built-in tools (bash, python).
- Enhanced the SkillCompiler to filter out disabled tools in tool groups, ensuring only enabled tools are rendered.
- Added tests to verify the correct behavior of tool group filtering and rendering.

api/core/skill/entities/skill_metadata.py

@@ -29,6 +29,7 @@ class ToolReference(BaseModel):
     type: ToolProviderType
     provider: str
     tool_name: str
+    enabled: bool = True
     credential_id: str | None = None
     configuration: ToolConfiguration | None = None