Native NDSL types for GT4Py 2D temporaries

[FlorianDeconinck]

Description

Following the merge of GridTools/gt4py#2314 which brought 2D temporaries to GT4Py, we adjust the FrozenStencil to pass down NDSL gtscript types overload for a seamless experience.

Upgrades GT4Py to include:

• 2D temporaries
• Removal of cuda backend

How has this been tested?

Unit test covers new usage of 2D temporaries.

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/)
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included

[romanc]

Let's not make tests more complicated than the need to be. Otherwise LGTM!

[twicki]

A test still depdends on the cuda backend, here a quick fix: FlorianDeconinck#1

[FlorianDeconinck]

Block behind GridTools/gt4py#2343

It's been fixed and the reviewer is presently hugging a baby, a fine activity.