Add coverage for OCI labels and annotations

[tonistiigi]

Currently only added support for title. Note that labels have slightly different names.

go-imageinspect/load.go

Lines 158 to 160 in 3ce5991

	if title, ok := annotations[AnnotationImageTitle]; ok {
	img.Title = title
	}

Defined in https://github.com/opencontainers/image-spec/blob/main/annotations.md#pre-defined-annotation-keys