[ET-VK][10/n] copy node, aten.repeat

[yipjustin]

Stack from ghstack (oldest at bottom):

• -> #3299
• #3219
• #3172

1. Introduce a CopyNode for generic copy-with-offset operations.
2. aten.repeat on all dimensions. 2.1 Use CopyNode where possible. 2.2. Specialized repeat_channel shader to handle packings
3. Update codegen to support Methods variant only operations. Need a new route to trigger the dispatch.

Differential Revision: D56499329

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3299

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:x: 1 New Failure

As of commit 11d278e9596b7cc5bdf38170a0ed38b4451f5f23 with merge base b669056c1cff5f7fe3786df9e68a14447cd5410b ():

NEW FAILURE - The following job has failed:

• pull / test-pybind-build-linux (cmake) / linux-job (gh) RuntimeError: Command docker exec -t 7443b015ebc49d707ff890002d69c8763939e186760e988caa719d8da8f0acb7 /exec failed with exit code 1

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This pull request was exported from Phabricator. Differential Revision: D56499329

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This pull request was exported from Phabricator. Differential Revision: D56499329

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This pull request was exported from Phabricator. Differential Revision: D56499329

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This pull request was exported from Phabricator. Differential Revision: D56499329

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This pull request has been merged in pytorch/executorch@b2c794a67ab457b8d0508db7e36c2c71f6b3cfc8.