Migrate from Poetry to UV

[devinmatte]

Migrate our package manager from poetry to UV

We can model the change off of PRs transitmatters/mbta-performance#61 and transitmatters/new-train-tracker#259

Ensure we

• Swap Poetry with UV
• Swap Black and Flake8 with Ruff
• Update vscode settings.json
• Update extensions.json for vscode
• Update README (maybe improve it while you're at it)
• Update all CI
• Update .gitignore
• Add pre-commit hook
• Update pyproject.toml to new format