[ET-VK] Conv2d quantize/dequantize ops for conv2d activations

[SS-JIA]

Stack from ghstack (oldest at bottom):

• -> [ET-VK] Conv2d quantize/dequantize ops for conv2d activations #14330
• [ET-VK] Improve q8 matmul by increasing TILE_N4 #14597
• [ET-VK] Add kInt8x4 dtype and GPUMemoryLayouts for packed quantized tensors #14329

Context

As title. Add shaders to quantize a floating point conv2d input tensor to packed int8 memory layout and dequantize a int8 conv2d output tensor back to floating point representation.

Hooking it up to the export logic will be handled in a follow up diff.

Differential Revision: D82542335

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14330

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❌ 3 New Failures, 1 Cancelled Job, 3 Unrelated Failures

As of commit ffec699 with merge base c18abc8 ():

NEW FAILURES - The following jobs have failed:

• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t c7ac157a850b9d14317d9c7d34a7122ee88b500c1fd35016df39837e8404892b /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 6b061ed11d5d6ef5b1ca4decb3b806d354591579de1c3181107f08ccef50f830 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t c9f3bb6e335f6aaa9377f91b5ee2647cf8c3641ad9c0a61b9a34e4a809a9849a /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-setup-linux-gcc / linux-job (gh)

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

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[facebook-github-bot]

@SS-JIA has exported this pull request. If you are a Meta employee, you can view the originating diff in D82542335.

[facebook-github-bot]

@SS-JIA has exported this pull request. If you are a Meta employee, you can view the originating diff in D82542335.

[facebook-github-bot]

@SS-JIA has exported this pull request. If you are a Meta employee, you can view the originating diff in D82542335.

[facebook-github-bot]

@SS-JIA has exported this pull request. If you are a Meta employee, you can view the originating diff in D82542335.