[native] Sort thread list

Summary: Display PERSONAL threads, then all the other threads and pending threads at the end

Test Plan: Created some threads and verified that all the personal threads are displayed before the others. Also verified that all the pending threads are displayed at the end.

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian

Differential Revision: https://phabricator.ashoat.com/D469