[w3c/payment-request] Teach retry() about payerErrors (#716)

BUILD ON #715

The following tasks have been completed:

 * [ ] Confirmed there are no ReSpec errors/warnings.
 * [ ] Added Web platform tests (link)
 * [ ] added MDN Docs (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)

Impact on Payment Handler spec? 

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/716

-- Commit Summary --

  * WIP: retry() shell
  * define aborting and retrying
  * return promises rejected
  * complete() throws if retrying
  * Link to initial tests
  * Guard against calling request.abort() again
  * fix typo
  * Refactor pasta
  * Make it clear the UI is shutting down
  * remove redundant checks
  * Clarify closing, add asserts back in
  * Teach retry() about payerErrors

-- File Changes --

    M index.html (314)

-- Patch Links --

https://github.com/w3c/payment-request/pull/716.patch
https://github.com/w3c/payment-request/pull/716.diff

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