Create a loss function mecanism for learning

Implement a set of loss functions that will automatically fill the gradient of the input Tensor.

changed milestone to %aidge_core - v0.2.0

added AddFeature Important LanguageC++ PriorityHigh labels

assigned to @pineapple and @thibaultallenet

added to epic &7 (closed)

added IssueMissing Feature label

removed AddFeature label

changed the description

created branch 73-create-a-loss-function-mecanism-for-learning to address this issue

mentioned in merge request !78 (merged)

added StatusTODO label

marked this issue as blocking #81 (closed)

removed StatusTODO label

Implemented in aidge_learning module and !78 (merged)

closed