[WebNN EP] Support Squeeze Op (#16361)
### Description
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Adds support for the Squeeze Op to WebNN EP.
It shares the similar parameters as Unsqueeze, so they are merged.
### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->
Enable more models to run on WebNN EP.
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Co-authored-by: Dwayne Robinson <fdwr@hotmail.com>
