Increased Speed of Calculations on GPUs

[JaredW40]

The application of fft's was not parallelized, so GPU methods were typically slower than CPU until input size increased significantly. Now, both CUDA and Metal should significantly outperform CPU methods as signal size increases. More testing / fixes may be needed for Metal.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.77778% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.97%. Comparing base (f18c55f) to head (76c9a44).
⚠️ Report is 101 commits behind head on master.

Files with missing lines	Patch %	Lines
src/apply.jl	87.77%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #80       +/-   ##
===========================================
+ Coverage   54.32%   75.97%   +21.64%     
===========================================
  Files           7        8        +1     
  Lines         670      745       +75     
===========================================
+ Hits          364      566      +202     
+ Misses        306      179      -127     

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