added gradient-x

[jo-mueller]

I added some code to make the gradient_x opencl kernel available

[StRigaud]

good job!

[codecov-commenter]

Codecov Report

Base: 77.55% // Head: 77.67% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (f7202a8) compared to base (755521a).
Patch coverage: 97.29% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   77.55%   77.67%   +0.12%     
==========================================
  Files         155      158       +3     
  Lines        7894     7941      +47     
==========================================
+ Hits         6122     6168      +46     
- Misses       1772     1773       +1     

Impacted Files	Coverage Δ
clic/include/core/clesperanto.hpp	91.66% <ø> (ø)
tests/gradient_x_test.cpp	95.23% <93.75%> (ø)
clic/include/tier1/cleGradientXKernel.hpp	100.00% <100.00%> (ø)
clic/src/core/clesperanto.cpp	89.23% <100.00%> (+0.06%)	⬆️
clic/src/tier1/cleGradientXKernel.cpp	100.00% <100.00%> (ø)

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