[AIRFLOW-5739] Move google cloud platform functions to providers package

[chicochico]

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Description

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Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason: Already tested

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[mik-laj]

Can you add backward compatiblity and add deprecation warnings?

[chicochico]

@mik-laj I added the warnings and backward compatibility, I also rebased to the current master.

[mik-laj]

Travis is sad. We also have warnings in the airflow.contrib package. Can you update them? Travis is sad. Can you fix it? Can you add tests in https://github.com/apache/airflow/blob/master/tests/test_core_to_contrib.py?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mik-laj]

Done. I did it while reorganizing the remaining packages.