Re: [w3c/payment-handler] Add userHint to PaymentManager (#206)

> Why?

I'm not sure how familiar the folks are with the "insert before" paradigm. If do go with it, I'd prefer to augment the current `set()` method instead:

```webidl
interface PaymentInstruments {
  ...
  Promise<void> set(DOMString instrumentKey,
                    PaymentInstrument details,
                    DOMString? instrumentKeyBefore);
};
```

If the `instrumentKeyBefore` is not provided, then `details` is inserted at the end of the ordered map.

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