IntelPython / dpnp / 28008983565

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Return tuple instead of list from atleast_1d/2d/3d and ogrid (#2965)

NumPy returns a tuple of arrays (not a list) from several functions that
yield multiple arrays.
This PR aligns dpnp with that behavior.

### What is done

- `dpnp.atleast_1d`, `dpnp.atleast_2d`, `dpnp.atleast_3d` and
`dpnp.ogrid` now return a tuple of arrays instead of a list.
Single-input
`atleast_*d` and single-slice `ogrid` still return a bare array, and
`mgrid` still returns a single stacked array (matching NumPy).
- Added/extended tests to assert the return container type matches
NumPy. While here, added the same parity checks for other
tuple-returning functions that lacked them (`nonzero`, `where`, `ix_`,
`tril_indices`, `triu_indices`, `unravel_index`, `unstack`).

The split family (`array_split`, `split`, `hsplit`, `vsplit`, `dsplit`)
and `histogramdd` still return lists, matching current NumPy.

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