Threads: Long press on message in Thread List view

[daniellekirkwood]

When the user is viewing the Thread List there should be actions available to them when they long press (or swipe) an item in the list.

Designs: https://www.figma.com/file/T309ztx0sNyOOK6NKVLHsK/Threads?node-id=1304%3A244172

[janogarcia]

@daniellekirkwood I've just checked and it seems there's currently no issue in the Threads epic for the Thread list actions. Those missing issues should include a link to the following mockups :

Android: Thread list actions
https://www.figma.com/file/T309ztx0sNyOOK6NKVLHsK/Threads?node-id=1304%3A244172

iOS: Thread list actions
https://www.figma.com/file/T309ztx0sNyOOK6NKVLHsK/Threads?node-id=2276%3A258216