Switched to YAML for the vocab definition

[iherman]

This is just a technical PR with no difference in the generated content for the vocabulary. The PR aligns the VCDM vocabulary generation structure to that of the data integrity one.

The generation uses now the separate tool. Apart from sharing a tool with the security vocab, YAML is now used as the format to define the vocabulary itself. YAML is (much!) easier to edit than CSV. I do not rely on any fancy feature of YAML (like cross references), just the basic stuff. The YAML file of the vocabulary is the file that should be modified whenever the vocabulary has to be changed.

[iherman]

The issue was discussed in a meeting on 2022-10-26

• no resolutions were taken

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1.1. Switched to YAML for the vocab definition (pr vc-data-model#954)

See github pull request vc-data-model#954.

Manu Sporny: #954, which Ivan has raised..
… To use a great new tool that he wrote, it allows you to take a YAML file and convert it to a vocabulary file. So the credential vocabulary is just generated from a really easy to use file, it's a great PR that will help us keep things up to date..
… Please take a look at it..

[iherman]

Per the comments of @msporny on the last WG call as well as those who formally approved the changes, I think it is o.k. to merge this PR.