Add ValueConversion attribute (unknown types)

Proprietary

An IValueConverter should be annotated with [ValueConversion]. Flags a converter that needs one but whose source and target types cannot be read off its Convert method.

OpenRewrite.Recipes.CSharp.CodeQuality.Wpf.FindValueConverterWithUnknownConversionTypes
mod run . --recipe=OpenRewrite.Recipes.CSharp.CodeQuality.Wpf.FindValueConverterWithUnknownConversionTypes

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