import iterable from collection.abc instead of collections to clear deprecation warning in python 3.10

[Narendra-Neerukonda]

Filled out the Dropbox Contributor License Agreement Fixes #392

[admackin]

This PR seems like it would be really handy as it would allow pyhive to be compatible with python 3.10. Any chance of it getting merged?

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[fabiofalavinha]

What's the ETA to merge this pull request?

[fabiofalavinha]

As a workaround, I just added the code on my python script:

if "3.10" in sys.version:
    collections.Iterable = collections.abc.Iterable