[issue14673] add sys.implementation

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

@Éric - that's a good point.  I considered it for a little bit, but went with the quick and easy think to get it rolling.

There is a real benefit to mandating an API sys.implementation.version.  importlib would use that version to calculate the tag to use for cached modules.  Without a specified/uniform data structure, that job is trickier.

Having an explicit sys.implementation.cache_tag field would solve that, and the importlib code would check for that field first.  However, I didn't want to start off with that as a "required" field, considering that only CPython would take advantage of module caches (as far as I know).

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