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This adds code to parse the maxCredentialCountInList and
maxCredentialIdLength fields from authenticatorGetInfo responses.

GetAssertionTask is changed to filter and batch allow lists when
silently probing credentials according to these values, if the
authenticator supports it. In particular, probing is skipped if the
allow list fits into a single batch (and the request doesn't have an App
ID that the GetAssertionTask might have to fall back to).

MakeCredentialTask similarly filters and batches before silently probing
for credentials in the exclude list parameter. Probing is skipped
entirely, if the exclude list fits into a single batch and the request
does not carry an appIdExclude extension.

Fixed: 954613
Change-Id: I644e602054e4e2ebb4101b98b867f5dbc61e0901
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867448
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708023}