[Copilot] Add support for uv package manager alongside pip

[msyyc]

Context
https://github.com/Azure/autorest.python/tree/main/packages/typespec-python/scripts has similar structure with https://github.com/microsoft/typespec/tree/main/packages/http-client-python/eng/scripts/setup

GOAL
Do similar change of PR microsoft/typespec#7760 for https://github.com/Azure/autorest.python/tree/main/packages/typespec-python/scripts

ASK

• DO NOT add file if the file doesn't exist in current repo.