Support (un)squeeze in XNNPACK delegate via conversion to view #7961
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Summary
This PR adds a new pass to the XNNPACK delegate to convert squeeze and unsqueeze nodes into views. These are then lowered to XNN static_reshape ops.
Note that this PR includes #7959, as it relies on lowering via view.
Test plan
Added test coverage at the pass and operator level under
backends/xnnpack/test/ops/test_squeeze.py
,backends/xnnpack/test/ops/test_unsqueeze.py
, andbackends/xnnpack/test/passes/test_convert_squeeze_to_view_pass.py
.