Extend ._tensor_impl with remaining functions used by dpnp

[vlad-perevezentsev]

This PR extends _tensor_impl in dpctl_ext.tensor with the remaining functions that are explicitly used in dpnp implementations (_take, _full_usm_ndarray, _zeros_usm_ndarray, _triu) enabling a complete switch to dpctl_ext.tensor._tensor_impl instead of dpctl.tensor._tensor_impl

It also adds take(), put(), full(),tril() and triu() to dpctl_ext.tensor and updates the corresponding dpnp functions to use these implementations internally

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/pull/2758/index.html

[github-actions]

Array API standard conformance tests for dpnp=0.20.0dev3=py313h509198e_49 ran successfully.
Passed: 1355
Failed: 2
Skipped: 7

[ndgrigorian]

if we're adding these functions in, should we start adding dpctl test suite as well?

Or would you rather start reusing the functions in dpnp and relying on dpnp tests?

I think it's sensible to have the two test suites and merge later if possible, but it's just a choice we have to make

[ndgrigorian]

I don't see much else that I would change, looks like you've looked over includes. Only question from my side is the test suite

@antonwolfy if you have any thoughts you should add them but this LGTM