iOS RGBA / Android ARGB color parsing disparity

[imhoffd]

On iOS, colors are parsed as RGBA, but on Android, colors are parsed as ARGB. This makes it difficult to use the same color input string cross-platform.

We should include a utility in @capacitor/android that offers RGBA color parsing to plugins so that we can consistently parse color input strings to Android values and the same color input string can be used in iOS and Android.

Don't forget to add this as a change that affects users in the Upgrade Guide. 😁

ref: #3719

[ionitron-bot]

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