[VitisAI] Int4 support (#22850)
### Description
<!-- Describe your changes. -->
1. Add support for throwing error when hardware is not supported for
VitisAI.
2. Add support for unloading VitisAI EP.
3. Add API for Win25.
### 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 requirement for Win25
