feat: support for AttributedString objects

[m1ga]

fixes #14401

Allows to use attributedString with a json object instead of creating an attributedString object first.

var win = Ti.UI.createWindow();
var text = "just some text in Titanium SDK";
var as = {
  text: text,
	attributes: [{
		range: [text.indexOf('some'), ('some').length],
		type: Ti.UI.ATTRIBUTE_FONT,
		value: {
			fontFamily: 'arial',
			fontSize: 12
		}
	}, {
    type: Ti.UI.ATTRIBUTE_BACKGROUND_COLOR,
		value: "red",
		range: [text.indexOf('Titanium'), ('Titanium').length]
	}]
};
var lbl = Ti.UI.createLabel({
	attributedString: as,
});
win.add(lbl);
win.open()

Code by @grebulon 👍

⚠️ Draft request: iOS version and docs will follow tomorrow