Re: [w3c/payment-handler] Suggest changing a shape of openWindow() (#300)

It seems a little odd that the Promise for `openWindow` would resolve once the window is closed.

If it becomes important in the future to have access to the `WindowClient` for some reason, another option would be to introduce a `waitUntilClosed` or `waitForClose` method on WindowClient that returns a promise when the window is closed.

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