[issue17621] Create a lazy import loader mixin

[Brett Cannon]

Brett Cannon added the comment:

So the approaches I have been using make a loader lazy, so what you have to change in terms of sys.meta_path, sys.path_hooks, etc. would very from loader to loader.

I have realized one tricky thing with all of this is that importlib itself inspects modules post-import to verify that __loader__ and __package__ have been set. That typically triggers an immediate load and so might need to be special-cased.

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