Create custom BriarRecyclerView and use it for the contact list.
It is a common pattern to have a list with an empty view and a progress bar. This commit introduces a custom BriarRecyclerView and uses it for the contact list. No more manually hiding and showing empty views and progress bars is necessary when using the new BriarRecyclerView instead of RecyclerView. Please note that this conflicts with !44 at the moment and needs to be implemented for !36 once merged. Closes #198
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