IANA registrations missing for new OpenID4VCI OAuth parameters

[Michael Jones]

The OpenID4VCI spec defines a number of new OAuth parameters of various types, a summary of which can be found at https://openid.bitbucket.io/connect/openid-4-verifiable-credential-issuance-1_0.html#name-oauth-20. IANA registrations need to be added for these new parameters.

[Mark Haine]

Migrated to GitHub

https://github.com/openid/OpenID4VCI