Improving perf in list load

[ZacSweers]

Some prior art in #18 #39

Currently there are some jitters in lists. Ideas for improving this:

• Switch items to ConstraintLayout
  • I for the life of me can't get them to work every time I've tried. They look fine in the editor, then explode at runtime.
• Switch to Litho
  • Probably most performant, but also pretty different
• Arch components paging (#39)
  • Could be done in tandem with the rest here
• Use spannablestrings for attribution and header texts to reduce view count
  • This could possibly make ConstraintLayout easier

[ZacSweers]

Another option https://facebookincubator.github.io/TextLayoutBuilder/