Refactor: split interp_rgi_translation and make it dimension-agnostic

[carnisj]

Break the function in order to optimize the memory usage (garbage collector) and to test it more easily.

Write unit tests for the new function.

Type of change

• [X] Refactor (non-breaking change)

Checklist:

• [X] I have added corresponding unit tests
• [X] I have run doit and all tasks have passed

[carnisj]

That's a good point, I overlooked a bit the docstring. Now it should be better