Updating cpu backend for bitshift with the new rounding attribute

Adapting backend_cpu [BitShiftImpl_kernels.hpp] and units test to use the new rounding attribute of bitshift operator as described in this issue [aidge_core#239 (closed)\]

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assigned to @noamzerah

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added 49 commits

• 7e048026...d34c4621 - 48 commits from branch eclipse/aidge:dev
• 50479099 - Updating cpu backend for bitshift with the new rounding attribute

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merged

changed milestone to %aidge v0.6.0