mapping object to go in raster or its own extension?

[cholmes]

It looks like we took out most of the raster fields, but the 'mapping object' seems to be an advanced raster thing - I think it tells you what different values of pixels actually mean? It doesn't seem like a generic 'file' thing. It perhaps could go in its own extension, but I think it's confusing in the file extension.

[m-mohr]

I planned to transfer the field to https://github.com/stac-extensions/classification, but I doubt I'll get to it in the next months.

[m-mohr]

See also the discussions in stac-extensions/raster#17

[m-mohr]

I think the best idea would be to deprecate file:values here once classification is out, but still leave it in for a while as this is already used in a couple of applications and the field specs may be a bit different in complexity.