[CoreAI] Add palletization support

[metascroy]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21760

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❌ 4 New Failures

As of commit ee2ab27 with merge base 161d9f9 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.pm.PackageManagerInternal.freeStorage(java.lang.String, long, int)' on a null object reference
• pull / test-qnn-models-linux (dl3) / linux-job (gh)
  curl: (22) The requested URL returned error:
• pull / unittest / linux / linux-job (gh)
  tosa-tools
• Test WebGPU Backend / test-webgpu / test-backend-linux (webgpu, models) / linux-job (gh)
  curl: (22) The requested URL returned error:

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