Add support for M3 tonal palettes

[rydmike]

Material Design 3 introduces Tonal Palettes instead of the M2 swatch.
https://m3.material.io/styles/color/the-color-system/key-colors-tones

Add feature to generate the Tonal Palette of a selected color and pick one of its colors.
Since the algorithms for it are public we can even use the same packages that Flutter SDK uses for the Tonal Palettes.
https://pub.dev/packages/material_color_utilities

[rydmike]

Closed via #38