Added "color" and "colorBlendMode" props in [FadeInImage](https://api.flutter.dev/flutter/widgets/FadeInImage-class.html) and applied it to both placeholder and the target image.

Added test to check weather both properties are applied to placeholder and the target image.

Fixes  https://github.com/flutter/flutter/issues/128229

Migration is not required because I have added two optional props and have not updated any existing code. Devs may choose to use them if they have a usecase. Existing projects should not get affected.(no errors or warning)