[API] Add bitwise_left/right_shift

[barry-jin]

Description

Add bitwise_left/right_shift standard APIs.
Tracked in #20579

In addition, I find that numpy operator tests in https://github.com/apache/incubator-mxnet/blob/master/tests/python/gpu/test_operator_gpu.py#L41 is overrided by https://github.com/apache/incubator-mxnet/blob/master/tests/python/gpu/test_numpy_op.py. So, I renamed test_numpy_op.py in tests/python/gpu to test_numpy_einsum.py.

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

[mxnet-bot]

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[barry-jin]

@mxnet-bot run ci [centos-gpu, unix-cpu, unix-gpu, website]

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[barry-jin]

@mxnet-bot run ci [unix-gpu]

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[barry-jin]

@mxnet-bot run ci [centos-gpu, miscellaneous]

[mxnet-bot]

Jenkins CI successfully triggered : [miscellaneous, centos-gpu]