Reset lightsState

Nobody has claimed this yet.

## New Feature

Hello @JvmField, why is `internal val INITIAL: LightsState = LightsState(MapboxLight.NoOp)` internal?
I think I need it to reset my style when my user disables 3D.

```
val styleState = rememberStyleState {
projection = Projection.MERCATOR
if (mapProperties.terrain3dEnable) {
terrainState = customTerrainState
lightsState = LightsState.DEFAULT
atmosphereState = currentAtmosphereState
} else {
terrainState = TerrainState.DISABLED
lightsState = LightsState.DEFAULT
atmosphereState = AtmosphereState()
}
}
```

I'm thinking of doing it this way, but then I don't see how to reset the light to INITIAL.

Start by tracing LightsState.DEFAULT and the internal INITIAL value based on MapboxLight.NoOp, then inspect how the styleState block applies lightsState when terrain3dEnable changes. Done means a user can disable 3D and reliably reset the lights to the initial state without relying on inaccessible API.

Written by the indexing model from the issue text.