Support adding general reactions to messages

[kaustubh-nair]

With #525 merged, we should be able to added all kinds of reactions to messages from ZT, we currently support only :+1:

For a v2 version, this can also extended to display the suggestions in the footer, once #540 is merged

[kaustubh-nair]

@zulipbot add "enhancement"

[neiljp]

Marked this as high priority, since this is something users likely switch to another front-end for (eg. webapp)

[zulipbot]

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