The purpose of this is to allow plugins to access certain internal APIs via
- Added PluginAPIKey and APIKeyManager for managing API keys associated with plugins.
- Introduced PluginAuthMiddleware to handle API key validation for plugin requests.
- Updated RouterDef to support plugin accessible endpoints with authentication.
- Modified various API registration functions to include plugin accessibility checks.
- Enhanced plugin lifecycle management to generate and revoke API keys as needed.
- Updated plugin specifications to include permitted API endpoints for access control.
