[CosmosDB] Adding support to retrieve and redistribute physical partition throughput

[ravgill]

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• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

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[yonzhan]

CosmosDB

[amar-sagare]

[evelyn-ys]

Please update the version in setup.py