feat: replace poetry with uv

[dlstadther]

Description

Switch from poetry usage to uv.

Motivation and Context

uv is up-and-coming and this is a playground repo for defining sample configurations. Trying it now.
Bonus: the setup instructions are very easy and don't require pyenv anymore (though, not a big deal).

How has this been tested?

All types of tests pass, CI works, README examples (except for publish to pypi) have been verified.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.