Expose a method to parse an image layout identifier

[jjbustamante]

Reason

As part of the implementation of the export to OCI Layout feature the RFC defines the
analyzed.toml file will be updated to include the reference format in case of layout is being used.

[image]
  reference = "<image reference>"

[run-image]
  reference = "<image reference>"

[previous-image]
  reference = "<image reference>"

Where

• [image|run-image|previos-image].reference MUST be either:
  • A digest reference to an image in an OCI registry
  • The ID of an image in a docker daemon
  • The path to an image in OCI layout format

We required to translate an image reference with the format [path]@[digest] and map it to an Identifier. Because imgUtil defines the layout.Identifier() implementation the best place to offer this utility method is on imgUtil repository.

Expected behavior

Considering an image identifier with the format [path]@[digest]
Expose a method like:

classDiagram

class layout {
   ParseIdentifier(identifier string) (Identifier, error) 
}

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