Feature request: mask_and_scale

[vboussange]

Hey there,
rioxarray exposes an argument mask_and_scale when opening a raster, which lazily scales the raster using the scales and offsets in metadata. Could we have this option in Rasters.jl, possibly in the Raster function?

Here is a quick proposition:

function scale(raster::Raster)
   T = typeof(raster.metadata["scale"])
   (raster .|> T) .* raster.metadata["scale"] .+ raster.metadata["offset"]
end

[rafaqz]

It's on the way!

See: #695

It's a bit trickier than that because it has to work lazily on larger than memory data, on RasterStack etc.

But it's pretty much there in the PR, just a few bugs to iron out.

[rafaqz]

Also this will be applied as the default when scale and offset are set. Keywords can turn it off.

[vboussange]

Excellent!