Add support for getting billing info from Google Pay

[krisloekkegaard]

Added metadata options to specify what, if any, billing info to require from Google Pay. Add the following entries to strings.xml in the Android project to enable additional data:

<bool name="email_address_required">true</bool>
<bool name="phone_number_required">true</bool>
<bool name="billing_address_required">true</bool>
<string name="billing_address_format">Full</string>

Billing address format can be set to Full or Min. If the metadata properties are omitted, the data will simply not be requested (same as current plugin behavior).

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[krisloekkegaard]

@rdlabo When you get a chance, it would be great if this could be merged. Or if you have comments/concerns, let me know 👍

[rdlabo]

@krisloekkegaard Hi, thanks for great work. looks perfect! I will merge.

[rdlabo]

Released: https://github.com/capacitor-community/stripe/releases/tag/v4.2.2

And updated docs. Thanks!