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This renames the UserEntity struct to Credential Metadata and adds an
|is_resident| bool field to track whether a credential in the macOS keychain
was created by a WebAuthn create() request with requireResidentKey set to true.
The credential ID format is evolved accordingly and legacy credentials created
before the introduction of this field will default to is_resident=false.

The calling code in the MakeCredential operation still refuses to create
resident credentials, so this change still does not enable creation of resident
credentials.

Bug: 1631393
Change-Id: I602195c9d240343eca330c8ddedec61133961bbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631371
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665287}