This PR is for performance only (at the cost of more template code and increased GPU code size)
The additional variants can help the caller skip the creation of temporary GPU mats (where memory is more likely to be a critical resource), and can even allow in-place processing.
magnitude/angles/x/y are often already interleaved when dealing with DFTs.

additional "typename" disambiguifiers  are required by some compilers

use globPtr() and PtrStepSz<> to bypass confusing reshape()
refactor tests

…opencv_contrib into cuda_phase_interleaved

the "empty mag" feature is useless for interleaved case
get row/col size from angle mat rather than mag mat than could be empty in other cases

code style and simplifications

the `make_tuple` or `tie()` helper returns a `cuda::std::tuple`, but `cuda` is then ambiguous between `::cuda` and `cv::cuda`.

removing `using cv::cuda` will help

The usage of `typename` seems different among compilers