schema: Modify AIM dependency declarations to use "app" and "imageID"

Modify the Image Manifest Schema so that it is more clear that the dependency is refencing an app by name and an image ID. (synchronize identifiers between AIM and CRM)

An image ID is a well-defined term in the specification. By synchronizing the identifiers in both schemas, it is clear that they are referencing the same things (referencing an app by name as opposed to naming the dependency itself).