Uv packager test

There's a new (yet another) package manager for python, uv. https://docs.astral.sh/uv/

It is close to pip but has some nice features.

For example "on-the-fly" environments that are fast.

Could be good for examples etc.

cd examples

uv run jupyter lab

And then one is up and running..

examples/README.md

+Run the examples in a simple way using uv (https://github.com/astral-sh/uv)
+
+cd examples
+uv run jupyter lab
+