Add Direct Lookups for LC Classification Schemes

[sfolsom]

Create direct lookups for the following LC Classification Schemes.

The Samvera QA Code seems to offer search for some LC vocabs: https://github.com/samvera/questioning_authority/wiki/Connecting-to-Library-of-Congress-%28LOC%29.

• Hopefully we can turn this on and add new vocabs for our app.
• If not, we’ve discussed the possibility of converting LC suggest2 json response into linked data that QA can recognize and use the linked data module to translate

Related links: See https://id.loc.gov/techcenter/searching.html for API documentation.

Example of a direct search config to base new config off: https://github.com/cul-it/qa_server/blob/f3083a8f1392e72890f8d6e6a763c9e0ace1ea0c/config/authorities/linked_data/oclcfast_direct.json#L32

[chrisrlc]

@sfolsom This is ready for you to test on lookup-int! Direct lookup results use the id.loc.gov api (same results as what you'd find here: https://id.loc.gov/search/?q=cs:http://id.loc.gov/vocabulary/classSchemes). Each result has an id, label, and uri parsed from: https://id.loc.gov/search/?q=cs:http://id.loc.gov/vocabulary/classSchemes&format=json

Please let me know if you'd like any changes!

Example endpoint: https://lookup-int.ld4l.org/authorities/search/loc/classSchemes?q=superintendent

Note: This is one of those lc authorities I mentioned that returns what appears to be duplicate results, e.g. https://id.loc.gov/search/?q=superintendent&q=cs%3Ahttp%3A%2F%2Fid.loc.gov%2Fvocabulary%2FclassSchemes. Our QA endpoint filters out these duplicate ids.

[sfolsom]

Looks good. I don't understand why https://id.loc.gov/search has duplicate results, but it's nice to see that the API results do not.