[w3c/manifest] Add payment handler installation URL. (#634)

This patch adds a `payment_handler_install_url` to the webapp manifest. A user agent may use this URL for just-in-time installation of a payment handler as described in https://github.com/w3c/payment-handler/issues/240. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/634

-- Commit Summary --

  * Add payment handler installation URL.

-- File Changes --

    M index.html (23)

-- Patch Links --

https://github.com/w3c/manifest/pull/634.patch
https://github.com/w3c/manifest/pull/634.diff

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https://github.com/w3c/manifest/pull/634