Star and unstar messages; show starred status

[gnprice]

This Zulip feature:
https://zulip.com/help/star-a-message

Out of scope for this issue is to show a message list for the narrow consisting of starred messages. We'll file a separate issue for that.

[sirpengi]

Figma here shows a star on a message: https://www.figma.com/file/1JTNtYo9memgW7vV6d0ygq/Zulip-Mobile?type=design&node-id=144-12134&mode=design&t=0WRxAzwpPfCOmmVT-0

[terpimost]

The basic idea here is Long tap > Star message > show icon on the right gutter (the same as in desktop zulip)
After that we could think of something better (swipe the message to a side to see buttons like iOS does)

[gnprice]

Cool, that sounds good. That long-tap interaction is the same as we currently have in zulip-mobile, then.

For the icon in the right gutter, is the current design in Figma all set, or are there any updates you'd like to make from that?