Cast Nodes Fusion (#24842)
### Description
<!-- Describe your changes. -->
We might have a case where multiple Cast nodes in the chain cast back to
the original type. This fusion will remove extra nodes.
E.g.
`A ('float32') -> Cast (to='float16') -> Cast (to='int4') -> Cast
(to='float32') -> Cast (to='float16') -> B
`
will reduce to
` A ('float32') -> Cast (to='float16') -> B
`
All the Cast nodes throughout the path need to have one input and one
output to be considered for the fusion.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Gemma3 ONNX models used to have double casting, and many new models
created by the model builder might have as well. Extra Casts might
reduce accuracy and increase inference time.
