Future: use sincos once available in oneAPI.jl

[rkierulf]

Feature Request

Currently we are working around the lack of sincos support in oneAPI.jl. However, sincos was recently implemented in JuliaGPU/oneAPI.jl@260a4dd. Once oneAPI tags a version with this commit, we can update our compat and make the following changes:

• In KernelFunctions.jl, use sincos to compute sin_φ and cos_φ together in the first line inside the for loop
• In the run_spin_precession! function in BlochGPU.jl, change _cis to cis, and remove the _cis function and implementation in GPUFunctions.jl and the KomaMRICore/ext files
• In the run_spin_precession! function in BlochSimple.jl, change the line calculating Mxy to how it was before, so that everything is inside exp