Arm backend: Propagate node info from quantizer to backend

[oscarandersson8218]

Use the Node meta 'custom' field to propagate information from quantizer to partitioner using a new ArmAnnotationInfo data class. This allows us to track quantized node reliably which is useful in order to track which nodes should 'fold' it's quantization parameter and which should be kept in fp when mixing integer and float in a sub-graph.

cc @freddan80 @per @zingo @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15300

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• AWS was down, GHA infrastructure effected / recovering

❌ 7 New Failures, 3 Unrelated Failures

As of commit 75af86c with merge base 02b535f ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t c5649e375b780244e21f4b088d43cf167d2a901f54da74a88214b5c371138549 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 83a4c45f1a006b3d07323b6550a0f347d53f31ab2778f55380d344aae2b7ffba /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t d48ad7d40e0c1b6312bd48f08327ee776c84f3f8e3bf7065469776665100f261 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 84a1b16387f3573f4c167d068bb82eca36fe9db3a73eb54fa968c372f4b55b84 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t eea4f86650ffabde3339ac9c57657fadd9e74d39b96c449035f325d98be0f12e /exec failed with exit code 2
• Test Metal Backend / export-voxtral-metal-artifact / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)

This comment was automatically generated by Dr. CI and updates every 15 minutes.