[ET-VK][int4] Wrap int4 linear calls with view_copy nodes to squeeze/unsqueeze inputs

Pull Request resolved: https://github.com/pytorch/executorch/pull/8226

This is done automatically for full-precision linear/mm nodes in the graph at torch.export graph tracing time, but is not done for the int4 op.

The new pass adds view_copy nodes, as there are subsequent passes which can fuse view_copy nodes if redundant, and convert view_copy nodes to squeeze/unsqueeze nodes.
ghstack-source-id: 264952606
@exported-using-ghexport

Differential Revision: [D69065866](https://our.internmc.facebook.com/intern/diff/D69065866/)

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Co-authored-by: Nathanael See <nathanaelsee@fb.com>