refactor: deprecate gt4py_utils.zeros() in favor of xumpy.zeros()

[romanc]

Description

gt4py_utils has a zeros() function, which is the same as xumpy.zeros(). This PR suggests to deprecate the one in gt4py_utils over the new one in xumpy.

There are a bunch of other functions in gt4py_utils that could be moved to xumpy. We can add them here for this release or do them in a follow-up PR for the next release.

How has this been tested?

Covered by existing tests: make_storage_data() (which is now based on xumpy.zeros()) is used to setup data in the translate test system.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. add new modules to docs/docstrings/): N/A
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules: N/A
• New check tests, if applicable, are included: N/A

[FlorianDeconinck]

Nice