[ET-VK][12/n] aten.cat with more codegen

[yipjustin]

Stack from ghstack (oldest at bottom):

• -> #3388
• #3351

1. The aten.cat operation are very straightforward using the copy_*_node.
2. Complexity comes from the code-gen. We need to introduce a AT_TENSOR_LIST type, which contains a list of AT_TENSOR with is_in=True. The tensor list itself as a container is not an IOValueRef, but the element inside are. It leads to some ugly if-then-else in the codegen.

Differential Revision: D56626865

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3388

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As of commit f63bd46bc1fe6442481136680cec6f504f5e31a9 with merge base e5471a5a7ade0f09b383e9ef1403cff73a0ccd1f (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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This pull request was exported from Phabricator. Differential Revision: D56626865

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This pull request was exported from Phabricator. Differential Revision: D56626865

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This pull request was exported from Phabricator. Differential Revision: D56626865

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This pull request was exported from Phabricator. Differential Revision: D56626865

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This pull request was exported from Phabricator. Differential Revision: D56626865

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This pull request has been merged in pytorch/executorch@fac1ae66410e1240d8a365255e01622810812f86.