[whatwg/encoding] Support GB18030-2022 (PR #335)

One legacy encoding was updated and relevant regulation requires software to match. As such the Encoding Standard should match as well. This aims to make the minimum number of changes necessary and does not impact GBK, only gb18030.

Updated tests are in https://github.com/WebKit/WebKit/tree/main/LayoutTests/imported/w3c/web-platform-tests/encoding/legacy-mb-schinese/gb18030. If these are deemed satisfactory they will be exported.

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<a href="https://whatpr.org/encoding/335.html" title="Last updated on Sep 17, 2024, 9:59 AM UTC (e43cf40)">Preview</a> | <a href="https://whatpr.org/encoding/335/e20f586...e43cf40.html" title="Last updated on Sep 17, 2024, 9:59 AM UTC (e43cf40)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/335

-- Commit Summary --

  * Support GB18030-2022

-- File Changes --

    M encoding.bs (406)
    A tools-gb18030-2022.py (70)

-- Patch Links --

https://github.com/whatwg/encoding/pull/335.patch
https://github.com/whatwg/encoding/pull/335.diff

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