Add issuer support for Token Status List #59
Description
The IETF Token Status List standard is emerging as the method for supporting credential statuses in a number of credential formats, including COSE-based formats like mdoc. See this section here for details specifically relevant for mdoc.
It would be good if this library could support a method that allows an issuer to addStatus to a Document such that it could appear as the value for the status attribute in the MSO that gets generated per this paragraph. As for the value of the status attribute, I think that's probably best left to the caller of this library as although only status_list is defined in the standard, it preserves the provision for others to define other values in this section.