Drop using the "images" library blueprint types and use the ones
from github.com/osbuild/blueprint/pkg/blueprint instead.
This also moves to the images library to v0.172.0 and the blueprints
library to v1.12.0 as this is required for this to work.
Add strict checking for toml keys in blueprints. This allows us
to error early if there are unknown keys in a toml blueprint and
helps our users by spotting e.g. typos early.
This is similar to
https://github.com/osbuild/bootc-image-builder/pull/549
(thanks Ondrej!).
This commit provides a `blueprintload` package that can be used
to load blueprints from json/toml from a path. This will be used
in `bootc-image-builder` and `image-builder-cli` and should
eventually be merged into `images`.
