Improve multitasking with CURAND

[maleadt]

Like #867.

[codecov]

Codecov Report

Merging #869 (96a769b) into master (6102c98) will increase coverage by 0.07%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #869      +/-   ##
==========================================
+ Coverage   77.21%   77.28%   +0.07%     
==========================================
  Files         121      121              
  Lines        7477     7502      +25     
==========================================
+ Hits         5773     5798      +25     
  Misses       1704     1704              

Impacted Files	Coverage Δ
lib/cufft/fft.jl	87.84% <75.00%> (-0.52%)	⬇️
lib/curand/CURAND.jl	91.66% <100.00%> (+5.95%)	⬆️
lib/curand/random.jl	93.18% <100.00%> (+2.41%)	⬆️

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