add isKeyboardInternallyHandled to allow custom logic again

[ImBeCiliC]

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[ImBeCiliC]

@kesha-antonov this should resolve these issues + adding back the functionality of having a custom keyboard handler
Fixes:
#2523
#2504

[JoniVR]

I agree that this option should be present, however, this current implementation doesn't remove the functionality entirely. The useAnimatedKeyboard reanimated hook also manipulates default adjustResize behavior. The hook is not unmounted in this implementation, so I assume this manipulation will remain present. See: https://docs.swmansion.com/react-native-reanimated/docs/device/useAnimatedKeyboard/#remarks

So ideally, the keyboard implementation gets implemented and lazily imported into the file.