Add JSON schema for cql-options.json

[JPercival]

The cql-options file defines translator options for cql. This plugin ought to be able to do validation / auto-completion of that file so that it's easy for a CQL author to get it right.

[p9g]

https://github.com/cqframework/clinical_quality_language/blob/master/Src/java/cql-to-elm/src/test/resources/org/cqframework/cql/cql2elm/json/CqlTranslatorOptions.json