[issue33414] Make shutil.copytree use os.scandir to take advantage of cached is_(dir|file|symlink)

[Andrés Delfino]

Andrés Delfino <adelfino at gmail.com> added the comment:

To be frank, I just searched the tree for uses of listdir() combined with isdir()/isfile()/issymlink(). Thought that using scandir() would make sense, and didn't think of a reason for not using it. That being said, I cannot state a case and I'll be happy to close the PR if there's no need for this :)

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<https://bugs.python.org/issue33414>
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