Create python binding for watch_change()

[stefanthorstenson]

• Add function watch_change
• Add class ParamChangeStream which implements Python async loop methods
• Update param.py example to run asynchronously, printing watched changes
• Expand documentation for "uv sync --group dev"

Blocked by bitcraze/crazyflie-lib-rs#57 (hence the failing build)

[gemenerik]

bitcraze/crazyflie-lib-rs#57 is now merged but requires releasing for successful build here