[android-splash] Introduce splash screen api to improve cold start aesthetics

[wax911]

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Feature Information

Cold starts typically show a white screen with nothing to display, we'd like to utilise the new androidx.core.splashscreen-core library to show a splash screen of AniTrend while other processes load prior to displaying our splash screen.

Solution Information

• Add the new dependency to libs.versions.toml
• Add new resource files to android-splash\..\res\values\themes.xml as required
• Update SplashScreen to accommodate the new splash screen API

Additional Context

See: https://developer.android.com/reference/kotlin/androidx/core/splashscreen/SplashScreen