[Material 3] Monochrome theme

[oculosdanilo]

Use case

I searched everywhere for a way to apply a monochrome ThemeData on Widgets. Found nothing.

Proposal

Would be nice to have a way to theme Widgets in grayscale, like this: (images taken from the official Android 14 site)

[oculosdanilo]

i'm dumb, didn't found https://pub.dev/packages/grayscale the time i made the issue

[github-actions]

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