The `nvcuda` backend is not compatible with python-cuda 13

[stijnh]

The nvcuda backend is broken as python-cuda 13 reorganized its internal structure.

Trying to use the nvcuda backend results in an error "cuda-python not installed".

However, the real reason is that KT imports modules that no longer exist in python-cuda 13.0.1:

kernel_tuner/kernel_tuner/backends/nvcuda.py

Line 13 in f9b223b

from cuda import cuda, cudart, nvrtc

Results in:

>>> from cuda import cuda, cudart, nvrtc
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'cuda' from 'cuda' (unknown location)

[isazi]

It seems to have changed a lot since last time, I can try to fix it today (if it wasn't fixed already).

Wonder if we need to keep compatibility with the past, or not.

[benvanwerkhoven]

Would be great if you could look into it! It is fine to just require v13 or above