Digital Identity Anchor updates from the GTR project

This issue has been raise to create a history / chain of evidence for initial proposed changes to the UNTP DIA description made by the UN/CEFACT Global Trust Registry (GTR) project.

The GTR project is tasked with reviewing the UNTP DIA spec as well as making recommendations that there should be a global registrar directory maintained by a UN Agency to provide a trustworthy reference list of authoritative nation-state registars.

A first pass of the existing DIA content (as presented here: https://spec-untp-fbb45f.opensource.unicc.org/docs/specification/DigitalIdentityAnchor/) has been made and some initial suggestions have been made and reviewed in the GTR project.

The GTR project is not yet in a GitLab environment, so the links provided below are to publicly accessible Google Documents.

The initial review and proposed changes was made by Marcos Allende. This document was subsequently reviewed by Sankarshan Mukhopadhyay and John Phillips and others.

The discussion document is here: https://docs.google.com/document/d/1k5Jpv4hAR2j-8BJP3eVxT0X2fMXipffHYXA6Op4wQnU/edit?usp=sharing

The cleaned-up version of this document is here: https://docs.google.com/document/d/1NLmsC3lSwgq_G0qBBnZhr1CGfCuM9podHdpDP0Whm8M/edit?usp=sharing