[add] Reciprocal operation

Context

To implement LayerNormalization meta-operation aidge_onnx#79 (closed), we should add support for Reciprocal operation.

Forward equation:

y = \frac{1}{x}

Backward equation:

\frac{\partial \mathcal{L}}{\partial x} = - \frac{\partial \mathcal{L}}{\partial y} \odot x^{-2}

• Core: !487 (merged)
• Backend - CPU: aidge_backend_cpu!193 (merged)
• Interoperability - ONNX: aidge_onnx!149 (merged)