[EXIR] Register _clone_dim_order op and map aten.clone

[keyprocedure]

Summary

This is PR 2 of 3 implementing a dim order aware clone op.

This PR registers the new _clone_dim_order op and maps aten.clone ops to dim_order_ops._clone_dim_order in EXIR during export to preserve memory layout changes (contiguous/channels_last). It also updates Core ML and ARM backends to handle the new clone op.

Related PRs:

• PR 1: #12974 - Add _clone_dim_order portable kernel
• PR 3: #12976 - Update RemoveCloneOpsTransform to be dim order aware

Fixes #12645

Test plan

• Operator level tests to verify kernel behavior for layout preservation and changes.
• Graph level checks to confirm that clone mapping occurs.
• End to end tests to validate that functional clone behavior is unchanged.

All tests pass via:
python -m unittest exir.tests.test_memory_format_ops_pass
python -m unittest backends.apple.coreml.test.test_torch_ops
pytest backends/arm/test/ops/test_clone.py
pytest backends/arm/test/passes/test_remove_clone_pass.py

[pytorch-bot]

🔗 Helpful Links

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❗ 1 Active SEVs

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• Multiple CI trunk failures after landing https://github.com/pytorch/pytorch/pull/161002

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