instantiate status bar contribs with services scoped to the window

[amunger]

fix #210383

current issues:

• line ending status bar contrib leaks over into the notebook editor now
• sometimes duplicate status items are added to the notebook editor in the main window when a text editor is open in the aux window
• status bar items are not re-added on reload, I'm not sure how this works for text editors

[bpasero]

There is a IEditorGroupService.onDidCreateAuxiliaryEditorPart event that editor status listens to to create status:

vscode/src/vs/workbench/browser/parts/editor/editorStatus.ts

Lines 901 to 904 in 0d7778d

	// Auxiliary Editor Status
	this._register(editorGroupService.onDidCreateAuxiliaryEditorPart(({ part, instantiationService, disposables }) => {
	disposables.add(instantiationService.createInstance(EditorStatus, part.windowId));
	}));

That should be called on startup when aux windows are restored and can be used to restore notebook status if thats an active editor.