Allow sortable headers with generic choosers

[th3hamm0r]

Is your proposal related to a problem?

It is quite easy to setup and customize the chooser modal. For example, you can add columns easily.
Unfortunately, you cannot use the "sort_key" to enable sortable columns, since those sort-headers aren't handled by the modal's JS.

That's probably the reason, why the sort_key is set to None here:

wagtail/wagtail/snippets/views/chooser.py

Line 33 in 79bc237

columns += [LiveStatusTagColumn(sort_key=None)]

Describe the solution you'd like

It would be nice to have this handled by wagtail's JS. I think this would probably also help wagtailmedia's outdated implementation (which allows sorting) to be ported more easily.

There are similar tickets for the page chooser, which could also benefit from that functionality:
#3544
#8557

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