Add build backend scaffolding (#7662)

scripts/packages/uv_backend/.gitignore

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+dist/

scripts/packages/uv_backend/README.md

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+# uv_backend
+
+A simple package to be built with the uv build backend.

scripts/packages/uv_backend/pyproject.toml

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+[project]
+name = "uv-backend"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = []
+
+[build-system]
+requires = ["uv>=0.4.15,<5"]
+build-backend = "uv"

scripts/packages/uv_backend/src/uv_backend/__init__.py

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+def greet():
+    print("Hello 👋")