Fix Cast_Op not working

Context

As stated by the issue #250 (closed), Cast operator was not working. This was due to the method setDataType() of OperatorTensor that was overwriting the output type.
This MR is dedicated to overwrite the method setDataType() of Cast_Op to set output type as targetType.

Modified files

• Cast.hpp and Cast.cpp, add setDataType() for Cast_Op;

include/aidge/operator/Cast.hpp

@@ -123,6 +123,13 @@ public:
      */
     inline DataType& targetType() const { return mAttributes->template getAttr<CastAttr::TargetType>(); }
 
+    /**
+     * @brief Sets the data type of the operator's tensors.
+     * @details This method needs to be overwritten because Cast_Op's output type needs to be set from targetType
+     * @param dataType Data type to set.
+     */
+    virtual void setDataType(const DataType& dataType) const override;
+
     /**
      * @brief Get the input tensor names for the Cast operator.
      * @return A vector containing the input tensor names.