[w3c/payment-handler] Require user interaction before payment handler response returned (#369)

This issue is the "design" complement to the security consideration pull request:
 https://github.com/w3c/payment-handler/pull/365

See some use cases and initial design ideas for ensuring that the user has an opportunity to confirm payment:
 https://github.com/w3c/payment-handler/pull/365#pullrequestreview-394293662

Ian

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https://github.com/w3c/payment-handler/issues/369