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This adds operator<<(std::ostream&) overloads for <webauthn.h> types and
FIDO_LOGs for each call to the WebAuthNMakeCredential() and
WebAuthNGetAssertion() Windows API functions.

Change-Id: I8c70efbe7c91daeb11fe66871379d8f457a6681d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759224
Commit-Queue: Martin Kreichgauer <martinkr@chromium.org>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688739}