[lib] implement hook to send text message from `InputStateContainer

Summary:
ENG-8424.

This code will handle both thick and thin threads, this is the point where we diverge logic, not in InputStateContainer on web and native.

Depends on D13327

Test Plan: Tested later in the stack

Reviewers: tomek, inka

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13328