Add new ARIA 1.1 attributes and roles

[maxmilton]

This PR adds the new ARIA attributes and roles as defined in https://www.w3.org/TR/wai-aria-1.1/.

I found which attr/roles had changed via:

• https://www.levelaccess.com/differences-aria-1-0-1-1-deprecations-additions/
• https://www.levelaccess.com/differences-aria-1-0-1-1-additions-role/

Originally I just wanted to use the new aria-role=switch in one of my components but as it turns out there's a bunch of new additions worth adding.

[codecov-io]

Codecov Report

Merging #1436 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1436   +/-   ##
=======================================
  Coverage   91.09%   91.09%           
=======================================
  Files         122      122           
  Lines        4491     4491           
  Branches     1406     1406           
=======================================
  Hits         4091     4091           
  Misses        158      158           
  Partials      242      242

Impacted Files	Coverage Δ
src/validate/html/a11y.ts	91.95% <100%> (ø)	⬆️

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[Rich-Harris]

thank you!