[Translate] Allow slicing of N-Dimensions fields

[FlorianDeconinck]

Description

We introduce a proper split between cartesian and data dimensions for slicing of N dimensions field in the input marshaling of translate data.

This completes the support for N dimensional inputs/outputs in the translate test.

• Better type hints

How has this been tested?

This doesn't touch the original behavior of "tracers as dictionary" which was the way to do 4D fields. This new feature is tested locally on the GEOS v11 version of dynamics.

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]

Can't say I understand how exactly this is working without running through an example. Code-wise it looks good to me. The npt import is an esthetic question.