support fetching me-card property for AddressBook

[AlmogBaku]

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Add the ability to fetch the "me-card" when retrieving the address book using FindAddressBooks

[emersion]

In which RFC is this property defined?

[AlmogBaku]

It doesn’t. It’s an apple custom prop.

However, since the “internal” package isn’t exposed, you can’t do lower level implementations.

In general, I think we might want to consider exposing it.