dimension_type "sky/block_light_tint" fields

it would be very simple, just two fields for each lighting tint per type:

"sky/block_light_tint": {
"tint_color": float,
"tint_strength": 0..1 (with 0 as no tint and 1 being visible even in light level 15)
}

this implementation would not only solve some problems i've had with custom dimensions and lighting, but it would also open a whole new dimension of opportunities for dimension customization. it's always good to have more tools at our disposal, for now all we can really do is change how bright the world is with ambient_light.