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Start removing event system

Churavy, Valentin requested to merge vc/nix_dependencies into master

Created by: vchuravy

As I have mentioned over the last little while I would like to remove the event system. Over the years it has proven itself to be cumbersome, and prone to introduce bugs.

In contrast @maleadt developed a task-based concurrency scheme for CUDA.jl that is rather elegant and doesn't introduce a new terminology beside Julia's existing tasks.

This is the last big chance I forsee and I plan on KernelAbstractions 0.9 to be a direct pre-cursor to 1.0.

Things that need to be hammered out:

  1. Does this also work with the oneAPI and ROCm backend?
  2. synchronize(::Device) is rather nice, but is also exported by CUDA.jl
  3. For 1.0 can we add KA as a dependency to GPUArrays.jl and move CUDAKernels.jl into CUDA.jl

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