Update on "[ET-VK] Adding all tensor packing support for native layer norm."

This diff updates Executorch Vulkan backend's `native layer norm` operation to support width, height and channel packed tensors.
. and adds new test cases to the cases.py file to test the operation.

Differential Revision: [D71663678](https://our.internmc.facebook.com/intern/diff/D71663678/)

[ghstack-poisoned]

Author: trivedivivek