feat: Add flag for isFavorite

[AdlerJS]

Is your feature request related to a problem? Please describe.
Most phones have the ability to "favorite" a contact to filter a larger list into a smaller set of closer contacts that the user often interacts with. Having this flag available in the data would be a useful projection to include.

Describe the solution you'd like
Most likely we would need to add a "favorite" projection to request the flag and then something as simple as isFavorite: boolean in the response

Describe alternatives you've considered
I've looked at the docs and pulled back all the info I can but it doesn't seem to exist with the existing dataset.

Additional context
I think this feature is useful for a variety of apps. For example if you were building an app where you wanted to invite people you could build at a list of "suggested invites" based on the users contacts. Or even building a better UI around the users contacts list to show the favorites at the top or with a particular UI element to distinguish them

[lb-ovc]

In general maybe checking if there are fields that could be added to the create method would be good.