feat(cuda): new fft impl

[sarah-quinones]

closes: please link all relevant issues

PR content/description

Check-list:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Relevant issues are marked as resolved/closed, related issues are linked in the description
• Check for breaking changes (including serialization changes) and add them to commit message following the conventional commit specification

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[agnesLeroy]

The new FFT has been merged, as well as a fix for cast to torus, so I'm closing this one.