Add top-level setup.py

[chajath]

It helps since some python build systems won't let devs do subdirectories, and the release schedule can be a little behind commits.

Issue #, if available:

Description of changes: Add top-level setup.py that redirects to python/setup.py

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[chajath]

nope, this doesn't work.. sorry will reopen it once I figure it out.

[mufeili]

Could you provide a reference for explaining the issue and practice, a blog post?