update cmake configuration

[StRigaud]

rearrange cmake files to simplify backend option.

Backend is now control by the cmake variable CLE_BACKEND_TYPE which is by default "OPENCL".

Values can be OPENCL, CUDA, or ALL.
They can be pass to cmake CLI configuration stage as such -D CLE_BACKEND_TYPE="OPENCL"

[StRigaud]

using this branch to test the macos-13 version instead of the latest

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.60%. Comparing base (106dbb9) to head (893719f).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   55.53%   55.60%   +0.06%     
==========================================
  Files         232      232              
  Lines        3715     3705      -10     
  Branches     1473     1473              
==========================================
- Hits         2063     2060       -3     
+ Misses        500      493       -7     
  Partials     1152     1152              

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