[w3c/payment-request] Modifiers (#828)

Closes #813 

Converts PaymentMethodData.data to IDL type or object. 
 
The following tasks have been completed:

 * [X] Confirmed there are no ReSpec errors/warnings.
 * [X] [Modified Web platform tests](https://github.com/web-platform-tests/wpt/pull/14205)
 * [X] Modified MDN Docs - obscure detail, not required. 

Implementation commitment:

 * [ ] Safari 
 * [x] Chrome - Implemented 
 * [x] Firefox - Implemented 
 * [ ] Edge (public signal)

Optional, Impact on Payment Handler spec?


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

  https://github.com/w3c/payment-request/pull/828

-- Commit Summary --

  * fix: convert PaymentMethodData.data
  * Link test, fix typo
  * Revert small change
  * Relocate var declaration of serializedMethodData
  * data -> PaymentDetailsModifier.data
  * Remove [[serialized*]] internal slots
  * Do .data IDL conversion in constructor

-- File Changes --

    M index.html (62)

-- Patch Links --

https://github.com/w3c/payment-request/pull/828.patch
https://github.com/w3c/payment-request/pull/828.diff

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