Add support for WebAuthN registrations

Drop github.com/tstranex/u2f as the implementation, in favor of github.com/duo-labs/webauthn.

mentioned in issue id/auth#12 (closed)

added 27 commits

• 39be8395...4cabb4df - 25 commits from branch master
• 48c9a65f - Add support for WebAuthN registrations
• d503e15d - Add comment field to Webauthn type

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Let's make this MR work in backwards-compatible mode, i.e. retaining the tstranex/u2f interface until all the other components have been safely migrated. This should allow us to work more easily with Gitlab-hosted artifacts.

added 9 commits

• d503e15d...d9ad73ca - 6 commits from branch master
• 28e017b3 - Add support for WebAuthN registrations
• 743c6032 - Add comment field to Webauthn type
• 5a45ec66 - Update go.sum

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added 1 commit

• 8cfdcfb5 - Add method to parse legacy u2f keys from cli/yaml

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added 1 commit

• ac022b21 - Use more robust U2F -> COSE conversion method

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added 1 commit

• fad32ea2 - Improve error checking in U2F key deserialization

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merged

mentioned in commit eef2497f