Add support for YAML-formatted vocabularies

[wbh1]

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• Completed

Describe the feature

Related

semi-related to #1068
Continuation of discussion in #993

Summary

This issue is being created to track the outcome of discussion in PR #993, in which it seemed the direction for supporting more vocabulary features is to allow YAML-formatted vocabularies.

Relevant comments:

Yes -- honestly, I'd like to move vocabularies to YAML files as well. This would make them much more robust in many ways (comment handling, feature additions, conditional entries, etc).¹

and

I'm going to try to get support for YAML-formatted vocabularies into the next release.²

Footnotes

1. https://github.com/vale-cli/vale/pull/993#issuecomment-2938809059 ↩

2. https://github.com/vale-cli/vale/pull/993#issuecomment-3790521759 ↩