update ci with pocl and test

[StRigaud]

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[StRigaud]

All look good now to test pyclesperanto with pocl, still need to add some more test and a coverage stat for fun.
Also make sure this is flexible without pocl or conda environment

[codecov-commenter]

Codecov Report

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Additional details and impacted files

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  Coverage        ?   1.95%           
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  Files           ?      17           
  Lines           ?     715           
  Branches        ?       0           
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  Hits            ?      14           
  Misses          ?     701           
  Partials        ?       0           

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[StRigaud]

This should be ready to merge.

What to remember from this PR:

• We can make CMake search for OpenCL first in the Conda env by populating the CMAKE_PREFIX_PATH var.
• POCL provide an OpenCL ICD against which CLIc and pyclesperanto can build on. More test in future should be done on if this ICD can see or not the devices outside the conda env.
• The compiled pyclesperanto.so lib could not find the libOpenCL even though it was used for compilation. Dynamic links where not saved. Filling the LD_LIBRARY_PATH was an option (not great), better alternative is to update the RPATH of the library in CMAKE. Full detail on how this works was not clear.

Lets merge this and see where it goes 🚀