Atmospheric scattering on some DirectionalLight's but not all?

## What problem does this solve or what need does it fill?

The ability to use Atmosphere to create atmospheric scattering for sunsets/sunrises is really amazing for sun DirectionalLight's. But it makes less sense if you also have a moon in the sky, which is a much dimmer light than the sun. (You might have both at the same time if you're transitioning from day to night or vice versa, on opposite sides)

## What solution would you like?

Would like to see a way to disable the atmospheric scattering / sunset / sunrise effect on some DirectionalLight's. Ideally you'd opt into the DirectionalLights you want it on rather than having it applied across the board.

## What alternative(s) have you considered?

Not sure of any.

## Additional context

N/A