Splash Screen Background Color for Dark Mode

[ghnp5]

#816 allows setting a themeColor for Dark Mode.

However, I believe the same should exist for backgroundColor, which sets the background color of the Splash Screen.

Currently, even if I'm on Dark Mode, the app shows a light-color screen while the app loads.

So, I propose a backgroundColorDark setting.

FAO @andreban

https://github.com/GoogleChromeLabs/bubblewrap/blob/2395d6aea6be141c146a1db435bc21fd06c41978/packages/core/template_project/app/src/main/AndroidManifest.xml#L135-L136

Thank you!

[GalaticStryder]

Any news on this? This would be a game changer for app that support switching the framework colors.