Serve Python import maps outside libcfgraph

[jaimergp]

• Comes from Design and implement a database for the conda-forge graph and relevant metadata #5
• Depends on Files-to-artifacts database / API / mapping #54

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This in the only source of data that we can't serve via OCI-backed or Anaconda.org-backed info/ metadata directly because it requires a global package search. We need to figure out how to present these maps without relying on libcfgraph-like setups (i.e. not another JSON in a repo?).

One way is to reutilize the files-to-artifacts mapping and compute the import-maps on the spot, because they can be inferred by the location of __init__.py modules, mostly.

[jaimergp]

Closed by regro/cf-scripts#2225