Update MetadataStatement to include friendly names

[joegoldman2]

FIDO Metadata Statement version 3 is currently used by default:

fido2-net-lib/Src/Fido2.AspNet/Fido2NetLibBuilderExtensions.cs

Line 77 in cb71a15

client.BaseAddress = new Uri("https://mds3.fidoalliance.org/");

The version 3 includes a new field friendlyNames which contains the description in alternative language. For example:

"metadataStatement": {
    "legalHeader": "Submission of this statement and retrieval and use of this statement indicates acceptance of the appropriate agreement located at https://fidoalliance.org/metadata/metadata-legal-terms/.",
    "attestationCertificateKeyIdentifiers": [
        "bab1487181fa4b7f6064b7f6bba6cff9efdfd71e"
    ],
    "friendlyNames": {
        "en-US": "Security Key NFC by Yubico"
    },
    "description": "Security Key NFC by Yubico",
    "authenticatorVersion": 328707,
    "protocolFamily": "u2f",
    // rest omitted for brevity
}

Spec: https://fidoalliance.org/specs/mds/fido-metadata-statement-v3.0-ps-20210518.html#alternativedescriptions-dictionary

This PR adds the field friendlyNames to MetadataStatement model.

Some authenticators still have the field alternativeDescriptions but the model for deserialization was not correct. For example:

{
    "legalHeader": "Submission of this statement and retrieval and use of this statement indicates acceptance of the appropriate agreement located at https://fidoalliance.org/metadata/metadata-legal-terms/.",
    "aaguid": "0076631b-d4a0-427f-5773-0ec71c9e0279",
    "friendlyNames": {
        "en-US": "HYPR FIDO2 Authenticator"
    },
    "description": "HYPR FIDO2 Authenticator",
    "alternativeDescriptions": {
        "en-US": "HYPR FIDO2 Authenticator"
    },
    "authenticatorVersion": 2,
    "protocolFamily": "fido2"
     // rest omitted for brevity
}

This PR fixes that too.

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All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #544      +/-   ##
==========================================
+ Coverage   73.95%   73.99%   +0.03%     
==========================================
  Files          98       97       -1     
  Lines        2638     2638              
  Branches      446      446              
==========================================
+ Hits         1951     1952       +1     
+ Misses        586      585       -1     
  Partials      101      101              

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[abergs]

This looks good! Thanks @joegoldman2