aux window - make it easier to create status elements in all opened windows

[bpasero]

No description provided.

[bpasero]

@benibenj can you see for your scroll lock feature. I also noticed that you did not localize all strings:

vscode/src/vs/workbench/contrib/accessibility/browser/accessibilityStatus.ts

Lines 77 to 84 in b549886

	this.screenReaderModeElement.value = this.statusbarService.addEntry({
	name: localize('status.editor.screenReaderMode', "Screen Reader Mode"),
	text,
	ariaLabel: text,
	command: 'showEditorScreenReaderNotification',
	kind: 'prominent',
	showInAllWindows: true
	}, 'status.editor.screenReaderMode', StatusbarAlignment.RIGHT, 100.6);

[benibenj]

Very nice! Works great