[lib] Add an alert to the lib config

Summary:
This will simplify showing alerts from our operations processing code.

https://linear.app/comm/issue/ENG-9686/some-messages-from-newly-created-chat-missing-on-secondary-device#comment-61c90aa7

Test Plan: Call these utils inside operations processing code and check if the alerts are shown on both web and native.

Reviewers: kamil, angelika

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13724