[New] update element role mappings

[jlp-craigmorten]

Resolves #553

The mappings for hgroup, s, and search elements are missing or are incorrect/outdated.

This updates as so:

• hgroup element is now associated with the group role and no longer associated with the generic role.
• s element is now associated with the deletion role.
• search element is now associated with the search role.

Relevant specs:

• https://www.w3.org/TR/html-aam-1.0/#el-hgroup
• https://www.w3.org/TR/html-aam-1.0/#el-s
• https://www.w3.org/TR/html-aam-1.0/#el-search

See also Web Platform Tests for HTML-AAM roles.

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Pull Request Test Coverage Report for Build 10141393379

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.491%

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Totals
Change from base Build 9879751240:	0.0%
Covered Lines:	285
Relevant Lines:	289

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💛 - Coveralls

[ljharb]

@jlp-craigmorten is this PR semver patch or minor, do you think?

[cmorten]

@jlp-craigmorten is this PR semver patch or minor, do you think?

Suspect at least a minor here: some of these mappings were likely revised or added in specs since their last manifestation in this project so a patch doesn’t quite feel appropriate as the introducing change wasn’t incorrect at the time.

Pertinent parts of HTML-AAM changelog:

• 12-Dec-2022: Revise mapping for s element to be role=deletion. See GitHub PR 442.
• 08-Mar-2023: Update hgroup element to be mapped to role=group. See GitHub PR 398.
• 24-Mar-2023: Add search element and its mappings. See GitHub PR 355.

REF: https://www.w3.org/TR/html-aam-1.0/#substantive-changes-since-moving-to-the-accessible-rich-internet-applications-working-group-03-nov-2019