[Feature]: Represent ToHaveJSPropertyAsync for JS value undefined

[rajsite]

🚀 Feature Request

Would like to be able to assert that an element has a property with JS value undefined using ToHaveJSPropertyAsync. It's not clear from documentation or tests in playwright-dotnet how that is done:

playwright-dotnet/src/Playwright.Tests/Assertions/LocatorAssertionsTests.cs

Lines 600 to 618 in 9dd8fee

	[PlaywrightTest("playwright-test/playwright.expect.misc.spec.ts", "should support toHaveJSProperty")]
	public async Task ShouldSupportToHaveJSProperty()
	{
	await Page.SetContentAsync("<div></div>");
	await Page.EvalOnSelectorAsync("div", "e => e.foo = { a: 1, b: 'string', c: new Date(1627503992000) }");
	var locator = Page.Locator("div");
	await Expect(locator).ToHaveJSPropertyAsync("foo", new Dictionary<string, object>
	{
	["a"] = 1,
	["b"] = "string",
	["c"] = DateTime.Parse("2021-07-28T20:26:32.000Z", CultureInfo.InvariantCulture),
	});
	await Page.EvalOnSelectorAsync("div", "e => e.foo = false");
	await Expect(locator).ToHaveJSPropertyAsync("foo", false);
	await Expect(locator).Not.ToHaveJSPropertyAsync("foo", true);
	await Page.EvalOnSelectorAsync("div", "e => e.itsNull = null");
	await Expect(locator).ToHaveJSPropertyAsync("itsNull", null);
	}

Seems to be possible in the JS library based on tests:
https://github.com/microsoft/playwright/blob/dcd350445226ec3c54cc16e8cad1189c61bf07c8/tests/page/expect-misc.spec.ts#L193-L197

Example

No response

Motivation

Better align playwright-dotnet with capabilities of playwright JS

[dgozman]

@rajsite Any ideas on the API? This is a known problem that we lack the special "undefined" value in .net to match javascript.