Remove all the internal package that are now in the
github.com/osbuild/images package and vendor it.
A new function in internal/blueprint/ converts from an osbuild-composer
blueprint to an images blueprint. This is necessary for keeping the
blueprint implementation in both packages. In the future, the images
package will change the blueprint (and most likely rename it) and it
will only be part of the osbuild-composer internals and interface. The
Convert() function will be responsible for converting the blueprint into
the new configuration object.
This represents how our systems should integrate into their environment, typically using
some sort of agent, or commonly cloud-init.
In the future we could imagine this representing network configuration or any other kind
of configuration necessary to reach the environment as well.
For now EC2 and Azure is supported, and stub environments are
added to show the idea, but these are not implemented/used
yet.
