Leverage dpnp.trace implementation through existing calls

[antonwolfy]

The PR proposes to implement dpnp.trace through two consequence call of diagonal and sum functions.
The similar approach is implemented in numpy and cupy.

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/pull/1842/index.html

[vtavana]

Thank you, @antonwolfy!