[issue22013] Add at least minimal support for thread groups

[Charles-François Natali]

Charles-François Natali added the comment:

> Tin Tvrtković added the comment:
>
> For your examples, my first instinct would be to use a thread pool executor. It's a nice high level API and can already do the aggregate join.

Indeed, the examples posted don't make much sense: thread/process
pools are the way to go.

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