Include cuda and cpp files in source distribution

[hellock]

No description provided.

[codecov]

Codecov Report

Merging #379 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #379   +/-   ##
=======================================
  Coverage   59.76%   59.76%           
=======================================
  Files         119      119           
  Lines        6288     6288           
  Branches     1087     1087           
=======================================
  Hits         3758     3758           
  Misses       2350     2350           
  Partials      180      180           

Flag	Coverage Δ
#unittests	59.76% <ø> (ø)

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