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SQL on FHIR view runner
This pull request adds the ability to execute SQL on FHIR view definitions against data sources within the library API.
It also includes a comprehensive refactoring that integrates this new functionality with the rest of the code base and makes some changes that will improve performance across all of the different FHIRPath query operations.
Resolves #1438 and #1759.
We need to make a corresponding change on this branch for c6b06e778944f209fde46f6a8250ebda3104f98b, so that we can properly handle the encoding of arrays of complex elements as null.