[w3c/payment-handler] Collecting use cases that require payment handler window to be 1P context (#370)

Let's use this issue to track use cases for payment handler being 1P context to help find the right implementation path for #351 .

- Login persistence: so user doesn't have to sign in on each merchant. Note this is in direct tension with separation of personas.
- WebAuthn credentials can only be created in 1P browsing context

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https://github.com/w3c/payment-handler/issues/370