Tweak HTMLToken / AtomHTMLToken data members for better packing. Also use Span<> more.
Pull request: https://github.com/WebKit/WebKit/pull/1303
Committed r295268 (251314@main): <https://commits.webkit.org/251314@main> Reviewed commits have been landed. Closing PR #1303 and removing active labels.
<rdar://problem/94393114>