[executorch][nvidia][tensorrt][3/n] Add TensorRT partitioner stub

[shoumikhin]

Stack from ghstack (oldest at bottom):

• [executorch][nvidia][tensorrt][25/n] Share CUDA stream across TRT delegates #17936
• [executorch][nvidia][tensorrt][24/n] Add power and unary converters with model improvements #17935
• [executorch][nvidia][tensorrt][23/n] Add benchmark infrastructure #17934
• [executorch][nvidia][tensorrt][22/n] Add correctness tests #17933
• [executorch][nvidia][tensorrt][21/n] Add comparison and slice converters #17932
• [executorch][nvidia][tensorrt][20/n] Add bmm converter #17931
• [executorch][nvidia][tensorrt][19/n] Add SDPA converter #17930
• [executorch][nvidia][tensorrt][18/n] Add layer_norm and pixel_shuffle converters #17929
• [executorch][nvidia][tensorrt][17/n] Add embedding, expand, upsample converters #17928
• [executorch][nvidia][tensorrt][16/n] Enable MobileNetV3 model support #17927
• [executorch][nvidia][tensorrt][15/n] Add linear model support with addmm and permute_copy converters #17926
• [executorch][nvidia][tensorrt][14/n] Add additional converters (mul, sub, div, mm, relu) #17925
• [executorch][nvidia][tensorrt][13/n] Add examples, C++ runner and CI workflow #17924
• [executorch][nvidia][tensorrt][12/n] Add C++ runtime infrastructure #17923
• [executorch][nvidia][tensorrt][11/n] Complete preprocess integration with serialization #17922
• [executorch][nvidia][tensorrt][10/n] Add blob serialization format with I/O metadata #17921
• [executorch][nvidia][tensorrt][9/n] Implement preprocess basic implementation #17920
• [executorch][nvidia][tensorrt][8/n] Add TensorRTCompileSpec dataclass #17919
• [executorch][nvidia][tensorrt][7/n] Add converter utils and add converter #17918
• [executorch][nvidia][tensorrt][6/n] Add converter registry infrastructure #17917
• [executorch][nvidia][tensorrt][5/n] Integrate partitioner #17916
• [executorch][nvidia][tensorrt][4/n] Add operator support base class #17915
• -> [executorch][nvidia][tensorrt][3/n] Add TensorRT partitioner stub #17914
• [executorch][nvidia][tensorrt][2/n] Add TensorRT backend stub #17913
• [executorch][nvidia][tensorrt][1/n] Add directory structure and initialization #17912

Add partitioner stub that identifies and partitions TensorRT-compatible subgraphs.

Differential Revision: D93275059

[pytorch-bot]

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❌ 9 New Failures, 1 Unrelated Failure

As of commit 8a47e68 with merge base 01d21fa ():

NEW FAILURES - The following jobs have failed:

• pull / test-coreml-bc-macos (macos-m1-stable) / macos-job (gh)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under '/Users/ec2-user/runner/_work/executorch/executorch/test-infra/.github/actions/check-disk-space'. Did you forget to run actions/checkout before running your local action?
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t dad512adc48eccab98b2855af5cf6e2429dbb702b63cb701f3cb521b686e62ba /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under '/Users/ec2-user/runner/_work/executorch/executorch/test-infra/.github/actions/check-disk-space'. Did you forget to run actions/checkout before running your local action?
• pull / unittest-buck / macos / macos-job (gh)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under '/Users/ec2-user/runner/_work/executorch/executorch/test-infra/.github/actions/check-disk-space'. Did you forget to run actions/checkout before running your local action?
• pull / unittest-editable / macos / macos-job (gh)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under '/Users/ec2-user/runner/_work/executorch/executorch/test-infra/.github/actions/check-disk-space'. Did you forget to run actions/checkout before running your local action?
• Test CUDA Builds / export-model-cuda-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 40337bc180cfc0e2005d3036aa1658e944acbebd667e659881797cd4d828ecf4 /exec failed with exit code 1
• Test CUDA Windows Export and E2E / export-model-cuda-windows-artifact (nvidia, parakeet-tdt, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 4fa20d76440129f124f13d24d76e86e2f848615bc1e1a9ca3a5de3fcfe309afb /exec failed with exit code 1
• Test Metal Backend / export-model-metal-artifact (mistralai, Voxtral-Mini-3B-2507, quantized-int4-metal) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• Test Metal Backend / export-model-metal-artifact (openai, whisper-small, quantized-int4-metal) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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

• periodic / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

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