Improve custom kernel call

[StRigaud]

add std::map<std::string, std::variant<cle::Image, float, int>> as a futur holder for parameter list
add typedef : ParametersMap
update custom kernel to fit execute from the prototype version for compatibility

[codecov-commenter]

Codecov Report

Patch coverage: 72.72% and project coverage change: -0.01 ⚠️

Comparison is base (9d55b53) 78.01% compared to head (ce24a16) 78.00%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage   78.01%   78.00%   -0.01%     
==========================================
  Files         272      272              
  Lines        9665     9681      +16     
==========================================
+ Hits         7540     7552      +12     
- Misses       2125     2129       +4     

Impacted Files	Coverage Δ
clic/include/core/cleImage.hpp	100.00% <ø> (ø)
clic/src/core/cleProcessor.cpp	71.56% <0.00%> (ø)
clic/src/tier1/cleCustomKernel.cpp	79.16% <57.14%> (-4.84%)	⬇️
clic/include/tier1/cleCustomKernel.hpp	81.25% <78.57%> (-18.75%)	⬇️
tests/custom_kernel_test.cpp	96.66% <100.00%> (+0.83%)	⬆️

... and 1 file with indirect coverage changes

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