Allow ExtractOIIOTranscode without colorspace, to just scale

Currently, if you want to use OIIO, you need to enable Color Management in your DCC, even if you don't want to use colorspace.

It would be useful to allow ExtractOIIOTranscode to support a setting like "Dont convert colorspace" so that we can also use it to just convert filetype or perform scaling, even if NO colorspace data exists in the input instance.

Because in those cases we don't want to mess with the colorspace of the image but JUST want to resize.

Already discussed here :

• Allow ExtractOIIOTranscode without colorspace, to just scale #1003 | AYON Core