[issue19842] selectors: refactor BaseSelector implementation

[Antoine Pitrou]

Antoine Pitrou added the comment:

> > The problem for documentation use is that we're christening it as an
> > official API, and thus it becomes more difficult to refactor the
> > inheritance hierarchy.
> 
> So what would you suggest?

Hmmm... Well I guess your proposal makes sense :-) Aka. having a
documented ABC, and then a private base implementation.

Otherwise, you can also document the methods without saying precisely to
which class they belong, which I started doing on asyncio, but
apparently it confuses some people.

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