Refactor post metadata and user/community chips

[hjiangsu]

Pull Request Description

This PR refactors the post view's metadata (comment count + date/time), and the post view username/community information.

• Removes the old PostCardMetaData widget
• Refactors PostViewMetaData to use the same widgets as the post card (for comment count, date/time)
• Refactored the logic for determining special users and colours.
• New widgets have been created for user/community chips which apply special colours and icons (similar to how comment header and post page show a user's special status)
• Fixed an issue where the full name widgets were not applying the proper instance colour - separate PR for this Fix user/community instance colour not being applied properly #1282

Issue Being Fixed

Issue Number: N/A

Screenshots / Recordings

Checklist

• Did you update CHANGELOG.md?
• Did you use localized strings where applicable?
• Did you add semanticLabels where applicable for accessibility?

[hjiangsu]

@micahmo I believe this should be good to go now if you want to take a look at it!

[micahmo]

I haven't tested but the code LGTM! Seems like a very nice refactoring! 😊

[hjiangsu]

Sounds good! I'll go ahead and merge this in (unfortunately, it might cause some merge conflicts on some other PRs but I'm hoping its not too much of a hassle 😅)

[micahmo]

Yes I think this will at least affect @iparks99 in #1300. But maybe the avatar could be made part of the UserChip?