Migrate deprecated CorePalette / Scheme APIs to CorePalettes + DynamicScheme

Package

dynamic_color

Description

Migrate from depprecated APIs

• CorePalette.fromList
• Scheme.lightFromCorePalette
• Scheme.darkFromCorePalette

to

• CorePalettes
• DynamicScheme (and concrete implementations like SchemeTonalSpot

Contrast

In doing so, we'll also be able to leverage Material's / Android's multi-level contrast:

Expected vs actual result:

1. Material 3 has introduced user-controlled color contrast which allows users to select three levels of contrast:
   
2. According to the linked specification, the color scheme should "automatically" inherit the system contrast settings. However, the dynamic_color plugin does not respect this setting. The colors provided by the plugin are always the same irrespective of the contrast setting.

Steps to reproduce:

1. Create a Flutter app and add the dynamic_color package.
2. Use DynamicColorBuilder to get the light and dark color schemes.
3. Run the app on Android where the contrast setting is supported. To change the contrast, go to Developer Options > Contrast.
4. After changing the contrast, open another app where dynamic color is supported like Google Drive to observe the differences.
5. Reopen the Flutter app. It can be observed that the colors do not change as per the selected contrast option.

Begin with the dynamic_color package's DynamicColorBuilder entry point and the Android contrast-setting reproduction described here. Trace how light and dark schemes are obtained, then verify the migration uses CorePalettes and DynamicScheme implementations and that the resulting colors vary across the supported contrast levels.