Add support for :target pseudo-selector

[Schleuse]

Hey 👋,

I'v noticed in a component I'd like to test that happy-dom always returns document when calling document.querySelector(':target').
After some digging I've found that happy-dom doesn't seem to support the :target pseudo-selector yet.

I've looked at the implementation of querySelector but I'm not feeling very comfortable to fix this myself as querySelector is such a performance critical method.

I've written a simple unit tests however to illustrate the expected behaviour of the :target selector

it('Returns matched element matching :target', () => {
	window.location.hash = 'id'

	const div = document.createElement('div');
	const div2 = document.createElement('div');

	div2.id = 'id';
	div.appendChild(div2);

	expect(div.querySelector(':target')).toBeNull();
	expect(document.querySelector(':target')).toBeNull();
	document.appendChild(div);

	expect(div.querySelector(':target')).toBe(div2);
	expect(document.querySelector(':target')).toBe(div2);

	window.location.hash = 'something-else';
	expect(div.querySelector(':target')).toBeNull();
	expect(document.querySelector(':target')).toBeNull();
})