feat(core): Implement schema creation mode #467
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This PR implements a new
SchemaCreationModesetting which allows to configure how ETL will deal with schema creation. It has two modes:CreateOnce-> the schema is created only for the first time the table is copied.CreateIfMissing-> the schema is created every time if it's missing downstream after the initial copy. This could be useful for cases where you don't want to restart the pipeline in case you delete the downstream table by mistake.