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This CL adds partial implementation of TrustedVaultConnectionImpl to
support basic scenario of authentication factor registion, when there
is known and pre-existing trusted vault key.

Bug: 1113598
Change-Id: I6d4e30afea7f6c42bd987c8df083dd166b6c8813
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413949
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824422}