onnxruntime

optimize SLN with large dimension (#18138)

### Description
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Optimize SkipLayerNorm for large dimension (>=2048) by handling 8
elements in one thread. It avoid the re-writing and re-loading sum of
input, skip and bias to main memory. It reduces the latency of dimension
4096 with small batch size from ~18us to ~3.8us on A100.

### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->