Add dpnp.trim_zeros implementation

[antonwolfy]

The PR adds implementation of dpnp.trim_zeros function.

All test scenarios are covered with new tests. Additionally tests/third_party/cupy/manipulation_tests/test_add_remove.py is included to verify with third party tests.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[vlad-perevezentsev]

LGTM!
Thank you @antonwolfy