COMPMID-3241: Add Layer Normalization to NEQLSTMLayer

COMPMID-3241: Add Layer Normalization to NEQLSTMLayer

- Add output quantization calculation to Layer Normalization
- Add members for Layer Normalization to NEQLSTMLayer
- Add configure/validate/run of Layer Normalization to NEQLSTMLayer

Change-Id: I278c8e0edbb21212f3afa4d4a336df0f1a4c1bfb
Signed-off-by: Sang-Hoon Park <sang-hoon.park@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3059
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>