Add an option to introduce friction when using the delete key

[murphpdx]

This feature requires that users hit the backspace key twice when deleting a value, unless the value is already selected.

I created a feature request here: #5670

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Latest commit: fd8530f

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[nick-keller]

Suggested change

	if (backspaceFriction) {
	if (focusedValue) {
	this.removeValue(focusedValue);
	return;
	} else {
	this.focusValue('previous');
	return;
	}
	}
	if (backspaceFriction && !focusedValue) {
	this.focusValue('previous');
	return;
	}

[websiddu]

Looking forward for this to getting merged :)