FR - Kaniko comment in config history

[AmiTal4]

Hello, Is it possible to add a comment for each layer built by kaniko? like buildkit does, something like this:

			History: v1.History{
				Author:    constants.Author,
				CreatedBy: createdBy,
				Comment:   "built by kaniko",
			},

this is nice for the image documentation.

also a question for the devs - why did you decide to not commit empty layers to the history? this can be pretty confusing for some scanning tools and I don't see how it helps much...