Add threaded copy

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #184 (2f4be04) into master (5cf7c0f) will increase coverage by 0.58%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   79.18%   79.76%   +0.58%     
==========================================
  Files           9       10       +1     
  Lines         490      514      +24     
==========================================
+ Hits          388      410      +22     
- Misses        102      104       +2     

Impacted Files	Coverage Δ
src/ThreadsX.jl	0.00% <ø> (ø)
src/utils.jl	72.46% <75.00%> (+0.15%)	⬆️
src/copy.jl	95.00% <95.00%> (ø)

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