Broadcasting for SLN for CPU and CUDA (#16510)
### Description
Enhanced SkipLayerNorm by implementing broadcasting for both CPU and
CUDA
### Motivation and Context
The input and skip tensors no longer have to be the same size which
means that it can accept data where the skip shape can be the same size
as the input shape, have a shape of {1, sequence_length, hidden_size},
or {sequence_length, hidden_size}.
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Co-authored-by: Tianlei Wu <tlwu@microsoft.com>
