onnxruntime

[VitisAI] support vaip create ep context nodes & bug fix (#21506)

### Description
<!-- Describe your changes. -->
1. We decided to move the context node creation back to our own repo because it is more flexible to modify.
2. We found a bug related the context node. It would change the inference order. So, we fixed in this PR as well.


### 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. -->
This is crucial for Microsoft Release next month.

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Co-authored-by: Yueqing Zhang <yueqingz@amd.com>