Add support of missing arguments in dpnp.amax and dpnp.amin

[antonwolfy]

The PR aligns supported arguments of dpnp.amax and dpnp.amin with numpy implementation.
The functions are only aliased on already updated dpnp.max and dpnp.min methods.

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[github-actions]

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

[vtavana]

Thank you, @antonwolfy!