[native] Display sidebar inline next to source message

Test Plan: Tested if sidebar is displayed correctly after source message, if clicking navigates to correct thread. Tested if promoted sidebar is still displayed correctly. Tested if correct number of replies is displayed. Tested for text/multimedia/robotext messages

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: zrebcu411, Adrian, atul, subnub

Differential Revision: https://phabricator.ashoat.com/D653