cql-to-elm project depends directly on Jackson

[JPercival]

The CqlTranslatorOptionsMapper class is used to serialize compiler options for CQL. This requires a direct dependency on Jackson, as seen here:

https://github.com/cqframework/clinical_quality_language/blob/master/Src/java/cql-to-elm/build.gradle#L23-L24

Ideally, we'd define a mapper API such that the serialization library could be swapped at runtime to account for numerous serialization frameworks, such as JAXB, Kotlin, etc. We have this pattern established already for ModelInfo and ELM, which support both JAXB and Jackson. See the model-jaxb and model-jackson modules as an example, which show how to define an interface and use a ServiceLoader at runtime to load the correct serialization dependency.