Using ICC Profile converter in V4

[Socolin]

Hello,

With #1567 done, I'm interested in start testing this features. But I'm hitting a few difficulty. (I'm using 4.0.0-alpha.0.46)

1. I was not able to find a way to use the ColorProfileConverter most of the related code seems to be internal. Since I'm doing composition between multiple image that will be printed later, I'm curious if it would be possible to load the images, work with them in CIELAB, or CIEXYZ, and then choose the profile when saving (for example a CMYK profile), so there is minimum loss, instead of converting everything to sRGB, then converting it again for printing.

2. I also found that it should be possible to convert the profile to sRGB during decoding. But when I tried with the images from here: https://displaycal.net/icc-color-management-test/ the pixels were not converted (Should I open an issue for that, or did I miss something ?)
   EDIT: It seems IsLikelySrgb is true for those tests profiles
   EDIT2: It works if I add return false in IsLikelySrgb()

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats;
using SixLabors.ImageSharp.PixelFormats;

var decoderOptions = new DecoderOptions
{
	ColorProfileHandling = ColorProfileHandling.Convert,
};
using var image = Image.Load<Rgba32>(decoderOptions, "sRGB_Gray.jpg");
Console.WriteLine(image[0,0]);
image.Save("sRGB_Gray_out.jpg");