Create strategy for extracting metadata from external-catalogs

When dealing with high level metadata (aka context metadata) the best place to find it is in the external catalogs and registries.

With this task, we should create strategy and a priority list for the registries we want to watch and the way we want to link the metadata found to an origin.

registries:

• fsf.directory
• wikidata
• libraries.io
• http://ascl.net/
• swhMath

packages managers:

• http://repo1.maven.org/maven2/ for Maven packages,
• npmjs.com for NPM packages

note: libraries.io already tracks this packages

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Migrated from T734 (view on Phabricator)