image-source: Add flatpak_image_source_new_for_location

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Which allows one to create an image source from a container location.

It also adds a new FlatpakDockerReference to access different parts of a
docker reference and changes to FlatpakOciIndex to get a manifest for a
specific architecture.

This will become useful in the next commit when we're going to add
support for installing OCI images.

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