[webgpu] Implement Split operator

[jchen10]

Test: onnxruntime_test_all.exe --gtest_filter=SplitOperatorTest.*

Description

Motivation and Context

[jchen10]

@xhcao @hujiajie

[xhcao]

Why do some validation in the Split constructor function, not in the ComputeInternal function? I see PrepareForCompute has already done some the same validation.

[jchen10]

If my understanding is right, in general the validation should be in the op's constructor function which is supposed to called during the session's initialization phase. For Split op, it can either have an attribute 'split' or input 'split'. If specified via input, its values are unavailable until the session's run phase, where the ComputeInternal function runs. This just follows what the CPU Split op does in the same way.

[jchen10]

Just removed the validation in the constructor , which should be unnecessary as PrepareForCompute basically does the same things.

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[xhcao]

LGTM

[guschmue]

/azp run ONNX Runtime Web CI Pipeline,Windows GPU CI Pipeline,Linux Android Emulator QNN CI Pipeline

[guschmue]

/azp run Linux CPU CI Pipeline,Linux CPU Minimal Build E2E CI Pipeline,Linux GPU CI Pipeline,Linux GPU TensorRT CI Pipeline,Linux OpenVINO CI Pipeline,Linux QNN CI Pipeline,MacOS CI Pipeline,Windows ARM64 QNN CI Pipeline,Windows CPU CI Pipeline

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Azure Pipelines successfully started running 2 pipeline(s).

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Azure Pipelines successfully started running 9 pipeline(s).

[guschmue]

/azp run Windows GPU TensorRT CI Pipeline,onnxruntime-binary-size-checks-ci-pipeline,orttraining-linux-ci-pipeline,orttraining-linux-gpu-ci-pipeline,orttraining-ortmodule-distributed,Windows x64 QNN CI Pipeline,Big Models

[guschmue]

/azp run Windows GPU CUDA CI Pipeline,Windows GPU DML CI Pipeline,Windows GPU Doc Gen CI Pipeline

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Azure Pipelines successfully started running 4 pipeline(s).

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