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).

Fix GlobalAveragePooling unit test following aidge_core#195 (closed).

assigned to @olivierbichler

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• 41b356b3 - Fixed unit test following aidge_core#195 (closed) fix

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• 5f4f8814 - FIxed dims in unit tests

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merged

mentioned in commit 43268e1a