User and community avatar support in chips

[iparks99]

Pull Request Description

Added toggle options to:

• Settings -> Appearance -> Comments -> Show User Avatar
• Settings -> Appearance -> Posts -> Post Body Settings -> Show Community Avatar

Wherever there is a User/Community Chip widget, the User/Community's avatar will be displayed if the appropriate toggle option is set to true.

Issue Being Fixed

Enhancement to display user and community avatars in post view.

Issue Number: #600, #1221

Screenshots / Recordings

Checklist

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

[hjiangsu]

Since the avatars may appear in other areas than these specifically (e.g., right now, the user avatar will appear in the post body, and in the future they may appear in the feed too), should these settings go under Appearance > Theming > Names?

Hmm, I think for now, we can leave them in their respective places. If the amount of settings become large enough, I was thinking of creating a new page to customize user/community avatars and chips under Appearance > User & Community Chips (maybe with a better name 😅). Thoughts @micahmo?

[micahmo]

I was thinking of creating a new page to customize user/community avatars and chips under Appearance > User & Community Chips (maybe with a better name 😅).

That makes sense to me! We could also put "Use Display Names" for both users and communities there!

[hjiangsu]

Yup, we don't have to do that in this PR though - it can be done separately! I'll go ahead and merge this one in. Thanks @iparks99 for the contribution again!