This introduces the RDFSource as a wrapper around an RDFServiceFactory and 2 ModelMakerFactorys.
This introduces ModelMakerUtils as a way to get the ModelMakers for context or for request.
Create implementations of RDFSource for SDB, TDB, and SPARQL.
The SDB implementation absorbs JenaPersistentDataSourceSetup and part of ConfigurationPropertiesSmokeTests,
which aren't needed unless we use SDB.
This is probably broken, without the subsequent changes.
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