feat(core/sortable-table): sortable tables

[sidvishnoi]

Closes https://github.com/w3c/respec/issues/3483

First attempt at sortable tables.

• Need to check for accessibility (announcements and relations that is. keyboard works ok thanks to <button>)
• Only supports ascending/descending and once sorted, cannot revert back.
• Check that it covers required use cases (works well for simple tables - haven't tested for colgroup, multiple tbody etc.)
• UI can be improved.

Live demo (check the last table).

[marcoscaceres]

The CORS rules got changed on w3.org, which is why historyURI is failing.

[marcoscaceres]

Looking pretty good. it's nice that it's so small.

[xfq]

I haven't had the time to look at the implementation yet, but I wonder if it can sort non-ASCII text as well? There are some functions available in JavaScript for sorting international strings, such as Intl.Collator and localeCompare.

One use case is this: w3c/jlreq#93

See also https://www.w3.org/TR/charmod/#sec-CollationUnits

[sidvishnoi]

Some notes for accessibility: https://adrianroselli.com/2021/04/sortable-table-columns.html

[marcoscaceres]

useful stuff there!