Implementation of bit shift operator

Implement the BitShift operator as defined by the ONNX standard. This operator performs element-wise bitwise shift operations on tensors.

assigned to @noamzerah

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mentioned in merge request aidge_core!200 (merged)

mentioned in merge request aidge_backend_cpu!88 (merged)

mentioned in merge request aidge_onnx!71 (merged)

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closed

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