webgpu: support int64 for Unsqueeze and Expand operators

[xhcao]

Description

Motivation and Context

[xhcao]

After supporting int64 for Unsqueeze and Expand operators, below models could use graph capture feature, and could get performance improvement.

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Models	Performance improvement (%)
florence-2-base-decoder-with-past-fp16	8%
jina-embeddings-v2-base-code	7%
jina-embeddings-v2-base-code-fp16	7%
jina-reranker-v1-turbo-en	6%
jina-reranker-v1-turbo-en-fp16	7%
sdunet-v1.5-demo-layernorm	20%
squeezebert-uncased	10%

@jchen10

[guschmue]

/azp run Linux QNN CI Pipeline,Win_TRT_Minimal_CUDA_Test_CI,Windows ARM64 QNN CI Pipeline,Windows GPU Doc Gen CI Pipeline

[azure-pipelines]

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