dcpy: Add capability to scrape input datasets from recipe

[sf-dcp]

It would be nice to automatically ingest input datasets for product recipes. Not all inputs can be automated: it depends on its source type. But we can create a fn that will try to extract as many as possible.

For now, it's meant to be a draft PR until we fully migrate to ingest code.

TODO:

• modify fn to set recipe path based on product's name. For example, when input = db-pluto, recipe path is ./products/db-pluto/recipe.yml
• write tests
• GHA?

[fvankrieken]

Love it. I do think this code should live somewhere within builds - even if it's doing ingest logic, it's a logical step that happens at the beginning of the build cycle and obviously is quite coupled to recipes which are really build entities