Search contacts in Google Workspace

[sosnovsky]

Currently when app performs contact search, it searches only in user contacts (contacts and contacts.other scopes), but when user is a member of Google Workspace it's also possible to search across all workspace members.

It requires additional authorization scope - https://www.googleapis.com/auth/admin.directory.user.readonly and using https://developers.google.com/people/api/rest/v1/people/searchDirectoryPeople API for searching workspace users.

This functionality is needed only for users who are members of Google Workspace, seems like we can check that in hd claim of user's id token - https://developers.google.com/identity/openid-connect/openid-connect#hd-param