Add ability to copy username/community on long press

[hjiangsu]

Pull Request Description

This PR adds the ability to copy the activity pub name for users/communities when long pressing on their names. Additionally, I've added the long-press into the bottom sheet as well as an alternative action.

Issue Being Fixed

Issue Number: #2045

Screenshots / Recordings

Checklist

• If a new package was added, did you ensure it uses an appropriate license and is actively maintained?
• Did you use localized strings (and added appropriate descriptions) where applicable?
• Did you add semanticLabels where applicable for accessibility?