Arm backend: Add is_node_supported checks for 4 ops

[Erik-Lundell]

For convolution, maxpool2d, avgpool2d, and sum.
The checks mostly target hardware constraints on
Ethos-U55, though convolution also checks for some
unsupported behavior.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 3 Cancelled Jobs

As of commit e0a9be4 with merge base 883ff14 ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• trunk / test-models-macos (cmake, add, portable, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-macos (cmake, llama, portable, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-macos (cmake, resnet50, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.

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[Erik-Lundell]

CI failure is unrelated, the PR only limits what ops we partition and should not affect accuracy
Edit: as per Zingo's comment, CI failure is indeed related.

[zingo]

macos fails unrealted