Add AttestationConveyancePreference enterprise support

[hochhaus]

Description

It would be nice if this library added support for enterprise attestation

Use Case

For enterprise deployments (where all hardware and configurations and centrally maintained) it would be nice to be able to request enterprise attestation.

Documentation

https://www.w3.org/TR/webauthn-2/#enum-attestation-convey

https://www.w3.org/TR/webauthn-2/#dom-attestationconveyancepreference-enterprise

https://groups.google.com/a/fidoalliance.org/g/fido-dev/c/TdCoQUsgFZU?pli=1

[james-d-elliott]

As far as I can tell the only implementation detail for RP's is the enum value "enterprise". If that's literally all then we can implement it relatively easily.

If there are some additional requirements or information in the attStmt we'd need to see those specific specs. If it's something that differs on browsers, devices, etc we'd need to have a way for the implementer to do specific validations.

[hochhaus]

Thanks @james-d-elliott.

As far as I can tell the only implementation detail for RP's is the enum value "enterprise". If that's literally all then we can implement it relatively easil

As best I can tell at the moment, adding the enum value and treating it otherwise as direct is likely enough.

I'm still new to the spec though so I could be missing something.