Remove dependency of backend CPU and fix CI

• Remove Backend CPU from CMakeLists.txt, setup.py and CI
• Add include shared script in build CI
• Add empty python requirements.txt for CI
• Generate random matrix in tests instead of loading an image from a path for CI on OVH
• Update Test to comply with opencv::convertNonZero that requires single channel array in v4.2 (https://docs.opencv.org/4.2.0/d2/de8/group__core__array.html#gaa4b89393263bb4d604e0fe5986723914)

changed milestone to %aidge_backend_opencv - v0.0.2

added LanguageC++ + 1 deleted label

requested review from @pineapple

assigned to @thibaultallenet

added 2 commits

• e5532a07 - Add empty python requirements.txt for CI
• 75f98290 - Generate random matrix instead of loading a path for CI tests

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changed the description

added 1 commit

• 8c2b45e9 - Remove backend_cpu dependency from setup.py

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changed the description

added 1 commit

• 14ed9577 - Update Tests_Utils

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added 2 commits

• 3fdb6589 - Remove temporarily Dataprovider test, no data on OVH
• a27ba523 - Update tests for opencv version compatibility with function countNonZero

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mentioned in commit 516846ea

merged

changed milestone to %aidge_backend_opencv - v0.1.0