Add Whisper VitisAI recipes

[NiranjanRaviGit]

• Adds VitisAI NPU recipes for running OpenAI Whisper small, medium, and large-v3-turbo.
• Enables Whisper encoder execution through ONNX Runtime VitisAI EP with WinML provider registration.
• Provides end-to-end speech-to-text inference scripts using local WAV input and Whisper decoding.
• Includes setup instructions for required Windows App SDK, ONNX encoder model, and VitisAI cache files.
• Adds model-specific configuration and sample audio to help users run the recipes.
• Preserves OpenAI Whisper MIT license attribution for the reused Whisper components.

[NiranjanRaviGit]

@microsoft-github-policy-service agree company="AMD"

[VishalX]

@jambayk / @xieofxie / @devang-ml could you pls review this?

[xieofxie]

model license should be put in the root folder of model

[NiranjanRaviGit]

Thank you, I have removed the License from child folders and updated the license file in root folder of the models.

[xieofxie]

it looks like not used