[native] Display number of replies
[native] Display number of replies

Test Plan: Open two instances of the app, with different users. Send a message to a sidebar and check if replies count increases in the other app.

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, atul, subnub, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D692

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