[edit: this PR looks big but except for the last 3-4 commits its just moving code from bib - and its green now :) ]

This PR moves the bootc-image-builder packages `bib/internal/

` over into the images library (with the full history).

Then it:

• add github.com/osbuild/blueprint as this is needed by "buildconfig"
• adjust the imports so that the packages integrate into bib
• rename buildconfig into bluepritnload as this is really what it is doing
• add some cleanup/docstrings to blueprintload
• rename "source" to "osinfo" to be a bit more specific now that its in images that has a lot of different meanings for "source"

I can split this into two PRs if that is prefered, once that just does the merge without any changes and one that contains the last two commit that do the renaming.

/jira-epic HMS-8839