[w3c/webpayments-payment-apps-api] Add explicit permission call to allow payment app to handle payments (#94)

In the current document, the request for permission to install an app occurs implicitly as part of the "setManifest()" processing. This is similar to the way permissions are handled in a host of existing web technologies, such as geolocation and getUserMedia.

The more recent pattern for these kinds of permissions requests (e.g., for push notifications) involves an explicit call to request permission before the action that requires permission is performed.

In @marcoscaceres' payment-request-handler doc, he proposes that the `paymentAppManager` object include an explicit `requestPermission()` method rather than this being an implicit step in setting up a payment app. I think this is an improvement, and would support adding it to the payment-app specification.

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https://github.com/w3c/webpayments-payment-apps-api/issues/94