Allows quick inline replies in chat push notifications. This will allow users
in compatible platforms (Windows 10+ / Chrome OS / Android N+) to reply
directly from the notification UI.
Probable follow ups include:
- inline replies for posts
- handling failure of reply
- fallback to draft creation if business logic error
- store and try again later if connectivity error
- sent inline replies lack the in_reply_to param
- i18n of inline reply action text and placeholder
