Automatically harvest source when harvesting packages?

When a new package is harvested, it would be great if ClearlyDefined also automatically harvested the corresponding source, if possible.

Thanks

The issue names only the package-harvesting flow and the corresponding source; no files, tests, or entry points are specified. Start by locating where new packages are harvested and how source availability is determined. Done should mean that source is automatically harvested when possible, with behavior and failure cases covered by tests.

Written by the indexing model from the issue text.