Mastodon now supports additional (optional) author information to show
as a byline on preview cards.
Use this (if included), to show the author's avatar, name, and link to
their profile. If tapped a click on a new `Target.BYLINE` target is
registered allowing fragments/activities to launch
`ViewProfileActivity`.
Include this as an action in `ListStatusAccessibilityDelegate`, and
provide `TrendingLinksAccessibilityDelegate` to provide accessibility
actions when viewing trending links.
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