src/vs/workbench/contrib/notebook/browser/services/notebookServiceImpl.ts/NotebookService/registerNotebookController
class NotebookService:	registerNotebookController(viewType: string, extensionData: NotebookExtensionDescription, controller: INotebookContentProvider): IDisposable {
		this.notebookProviderInfoStore.get(viewType)?.update({ options: controller.options });
		return this._registerProviderData(viewType, new ComplexNotebookProviderInfo(viewType, controller, extensionData));
	}