onnxruntime

Migrating ORT Extensions from Git submodule to cmake FetchContent (#14298)

### Description
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Merging extensions from Git submodule to cmake FetchContent


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

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Co-authored-by: Changming Sun <chasun@microsoft.com>
Co-authored-by: Jian Chen <jchen351@MacBook-Pro.local>