Add new op INSTANCE_NORMALIZATION.

Add reference CPU implementation for INSTANCE_NORMALIZATION with FP32/FP16
input data type.

Create tests for the new op.

Bug: 120064464
Test: NeuralNetworksTest_static
Change-Id: I1e632edf8fd9172ee40085cf7858d2a5c61f735e
Merged-In: I1e632edf8fd9172ee40085cf7858d2a5c61f735e
(cherry picked from commit e98f8595b420554352e64d5e31fbcf00c0a9a286)
13 files changed