https://m3.material.io/styles/motion/easing-and-duration/applying-easing-and-duration

• Add support for all curves
• Add support for all durations

Existing material curves are at https://github.com/flutter/flutter/blob/main/packages/flutter/lib/src/material/curves.dart#L26. We should probably create motion.dart and put everything there. Some thought needs to be put into the naming for legacy curves.