Fix clip implementation + add ReLU int8.

Fix clip implementation which was always converting input to float32. Now min and max are converted to input type.

• add ReLU int8.

changed milestone to %aidge v0.6.0

added Bug 🐛 label

assigned to @cmoineau

added StatusReview Ready label

enabled an automatic merge when all merge checks for d95abd33 pass

requested review from @noamzerah

approved this merge request

merged