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Add support for storing and retrieving large blobs through the WebAuthn
DevTools Domain. This will in turn be used by WebDriver to implement the
webauthn:extension:largeBlob capability [1].

This patch also wires up the CTAP version through devtools. This is a
soft requirement for large blobs, and will also be used to move
credProps tests to WPTs [2].

[1] https://w3c.github.io/webauthn/#sctn-authenticator-extension-capabilities
[2] https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/web_tests/http/tests/credentialmanager/credentialscontainer-create-with-resident-keys.html

Bug: 1114875
Change-Id: Ia9a5353285bd9aec540d5e92ec737919c7790b62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486254
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819488}