LabeledFieldView should be extendable

[oleq]

📝 Provide a description of the improvement

ATM if you want to put anything next (or over) the input like additional elements (an icon, a button to clear the input), there's no way to do that because children are hardcoded

ckeditor5/packages/ckeditor5-ui/src/labeledfield/labeledfieldview.js

Lines 210 to 224 in b5ded5a

	children: [
	{
	tag: 'div',
	attributes: {
	class: [
	'ck',
	'ck-labeled-field-view__input-wrapper'
	]
	},
	children: [
	this.fieldView,
	this.labelView
	]
	},
	this.statusView

The solution is to make the input wrapper a real view with a children collection you can push extra things into.

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