Move JSON parsing out of line (#14264)

Author: ktf

Framework/Core/CMakeLists.txt

@@ -140,6 +140,7 @@ o2_add_library(Framework
                        src/Task.cxx
                        src/Array2D.cxx
                        src/Variant.cxx
+                       src/VariantJSONHelpers.cxx
                        src/VariantPropertyTreeHelpers.cxx
                        src/WorkflowCustomizationHelpers.cxx
                        src/WorkflowHelpers.cxx