Draft: Simplify and optimize operators

The goal of this MR is to simplify and optimize operators through:

• Code factorization, with the introduction of the template OperatorTensorWithImpl;
• Strings elimination when not necessary, through the use of constexpr descriptors only.

assigned to @olivierbichler

marked this merge request as draft

added EnhancementStructure 🏗 label

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• 51fb7287 - Fixed linkage issue

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