Incomplete definition of `mandatory` in SD-JWT VC claim metadata

[danielfett]

The definition of the mandatory key in the claim display metadata in the format profiles in Appendix A seems to be incomplete for SD-JWT VC.

The first two read:

mandatory: OPTIONAL. Boolean which, when set to true, indicates that the Credential Issuer will always include this claim in the issued Credential. If set to false, the claim is not included in the issued Credential if the wallet did not request the inclusion of the claim, and/or if the Credential Issuer chose to not include the claim. If the mandatory parameter is omitted, the default value is false.

The one for SD-JWT VC reads:

mandatory: OPTIONAL. Boolean which when set to true indicates the claim MUST be present in the issued Credential. If the mandatory property is omitted its default should be assumed to be false.

Additional question: Why is there a normative keyword in the latter but not the previous two?

This is the PR introducing this change, but I don't have the time for archeology right now: #128

[Sakurann]

when we introduced sd-jwt vc profile we used the text which was the same as the rest of the credential formats - that one is the original one. however, at the same time, in the prep for ID-1, we updated to the text to the upper one in your issue. that one is most recent, so need to upgrade sd-jwt vc one to that one.

[danielfett]

Thanks for the clarification! Can you please check whether the definition that I used in this PR is up-to date?

https://github.com/openid/OpenID4VCI/pull/276/files#diff-1f424614b35a9899813079f1b1f6218631a2aedd993368ccb89bb81a9eda0289R2229-R2253