Add LRN operator

Add LRN operator, which is a bit legacy, but was there in N2D2 and is really cheap to add (and still used in some ONNX models).

assigned to @olivierbichler

changed title from Added LRN operator to Add LRN operator

changed the description

added Feature 🚀 label

added 56 commits

• 87b6e9b6...804f702d - 55 commits from branch dev
• 476a99f1 - Added LRN operator

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mentioned in commit 1c1faf4b

merged