Ingest Catalogs: get position from existing catalog (by id) #282
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Some catalogs like PS1-PSC (provides star/galaxy score for all PS1 sources) do not provide coordinates, but the identifier of an object in another catalog that has the coordinates.
This PR adds the code needed to crossmatch (by id) new entries to the entries of an existing catalog to fetch the relevant coordinates, and add them as the coordinates of the documents of the new catalog.
Also, we refactor the main method to split it in 3 methods, one per file format