Replace PyCuda with CuPy

Replaces PyCuda with CuPy

Advantages of CuPy:

• AMD support
• probably higher maintained due to NVIDIA support
• SciPy compatible.

added feature proposal label

requested review from @kuron

assigned to @holzer

added 1 commit

• 1989507b - Implement fallback case

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added 1 commit

• 6cca8c4e - Small changes

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resolved all threads

approved this merge request

enabled an automatic merge when the pipeline for 6cca8c4e succeeds

coverage.xml is missing (needs same change as pystencils@7c7f82cd) and lbmpy_tests/test_cpu_gpu_equivalence.py::test_force_driven_channel_short[scenario1] fails even after pystencils!330 (merged) was merged.

added 1 commit

• 625ad449 - Adapted coverage xml

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enabled an automatic merge when the pipeline for 625ad449 succeeds

mentioned in commit 7a7d351c

merged