Update media types according to WG resolution

[decentralgabe]

fix #282

as per the TPAC resolution on Friday September 27th

RESOLUTION: For VC-JOSE-COSE, we will proceed with a request to register application/vc+jwt, application/vp+jwt, application/vc+cose, application/vp+cose, application/vc+sd-jwt, and application/vp+sd-jwt. We will note in particular that the cty property is the point of differentiation for others that may wish to use identical media types. This group intends to use application/vc and application/vp as the cty values.

This PR updates the media types accordingly. Separately, there is a PR to the respec-vc plugin to fix the examples. This PR will be merged after the change to the respec-vc plugin is merged.

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[bc-pi]

As indicated in #282 (comment) I am "objecting" to the direction of this.

[msporny]

Other than the hex encoding concern for COSE, LGTM.

[philarcher]

AFAICT (OK, as far as MDN tells me :-) ), data URLs can only take text or base64. So good that this has been fixed.

[TallTed]

[editorial] Just a bit of language...

[brentzundel]

As indicated in #282 (comment) I am "objecting" to the direction of this.

@bc-pi to be perfectly clear, are you indicating that should this change be made, Ping Identity will be formally objecting to the publication of VC JOSE COSE as a recommendation?