Add command & commandfor attribute related mappings

[keithamus]

This adds the mapping for command and commandfor attributes as per the Invokers Explainer.

Additions:

• 3.6.25 command (in the Toggle, Show, and Hide popover states)
• 3.6.26 command (in the Close and Show Modal states)
• 3.6.27 commandfor

Test, Documentation and Implementation tracking

Once this PR has been reviewed and has consensus from the working group, tests should be written and issues should be opened on browsers. Add N/A and check when not applicable.

• [ ] "author MUST" tests:
• [ ] "user agent MUST" tests:
• [x] Browser implementations (link to issue or commit):
  • WebKit: https://bugs.webkit.org/show_bug.cgi?id=269672
  • Gecko:
  • Blink: https://chromium-review.googlesource.com/c/chromium/src/+/5942728
• [x] Does this need AT implementations? Yes
• [ ] Related APG Issue/PR:
• [ ] MDN Issue/PR:

WebKit internal tests: https://searchfox.org/wubkat/source/LayoutTests/accessibility/mac/expanded-notification-commandfor-popover.html

Chrome internal tests: https://source.chromium.org/chromium/chromium/src/+/main:content/test/data/accessibility/html/commandfor-api-popover.html;l=1?q=commandfor.*api&sq= & https://source.chromium.org/chromium/chromium/src/+/main:content/test/data/accessibility/html/commandfor-api-dialog.html

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