Automate generation of components list for accessibility testing

[calebtr-metro]

This issue is duplicated from emulsify-ds/emulsify-drupal#151. Automated accessibility testing of components more properly belongs in this project because this is where the components are now.

Expected Behavior

As a developer, I want all components to be automatically covered by accessibility testing.

Current Behavior

Compound does no accessibility testing from the command line, but Emulsify-ds does, using a manually curated list.

Possible Solution

A solution to generate the list of components using npx sb extract was proposed at emulsify-ds/emulsify-drupal#151 and implemented in emulsify-ds/emulsify-drupal#252.

In addition, the npm a11y script and a11y.config.js, the related test, the node dependency on the pa11y project will need to be moved to this project. Maybe more stuff, too.