[w3c/payment-handler] Add "Validate Methods Algorithm" (#197)

Validate the payment method identifiers that a service worker can use
depending on their validity and the corresponding payment method
manifests.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/197

-- Commit Summary --

  * Add "Validate Methods Algorithm"

-- File Changes --

    M index.html (143)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/197.patch
https://github.com/w3c/payment-handler/pull/197.diff

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https://github.com/w3c/payment-handler/pull/197