contact search finds very few contacts compared to gmail

[tomholub]

part of #606

On browser extension, I think the api that Google is deprecating is a lot more powerful than the People API. Could you resarch what is the proper way to search recipient using Google APIs?

Eg when I use Gmail, I can enter "joe" and it will find 20 different joe people I've communicated with before. But If I put "joe" in iOS, it will only find him if I manually created a Google contact for that person, which is not very useful.

(on the browser extension, we also loop through sent emails and create our own contact list from there. But would prefer to first see what to conventional API options are)