Support requested billing address fields in Instant Debits bank tab

[mats-stripe]

Summary

This adds the name, phoneNumber, and address fields / sections in the MPE Bank tab, if they are included as part of the merchant configuration. The email field will always be shown, even when the configuration specifies to never collect an email, if no email is provided in the default billing details.

Motivation

Respect the merchant's configuration!

Testing

Plenty of unit tests, and some manual testing:

Configuration	Screenshot
Automatic
Always or Full
Never, no defaults
Never, default email

Changelog

N/a

[github-actions]

🚨 New dead code detected in this PR:

InstantDebitsPaymentMethodElement.swift:106 warning: Property 'defaultAddress' is unused

Please remove the dead code before merging.

If this is intentional, you can bypass this check by adding the label skip dead code check to this PR.

ℹ️ If this comment appears to be left in error, double check that the flagged code is actually used and/or make sure your branch is up-to-date with master.

[mats-stripe]

Testing:

Screen.Recording.2024-10-18.at.3.35.10.PM.mov

[mats-stripe]

🚨 New dead code detected in this PR:
InstantDebitsPaymentMethodElement.swift:106 warning: Property 'defaultAddress' is unused

It's true this field isn't being used in InstantDebitsPaymentMethodElement, but it's being referenced in tests for now, and will eventually be passed to the payment details API when attachDefaultBillingDetails is set to true.