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This CL introduces a RecyclerView and prepares the list of credentials
to display more generic items (like the upcoming header element).

Bug: 1012219
Change-Id: I20b8361b2a139e89a493c5292f86b7bcece1c920
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857127
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705982}