feat: Implement TransformSchema support. #1838
Merged
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As discussed offline, Transformer plugins are going to need to explicitly provide a synchronous function to transform a schema.
Previously, I implemented a method by which this wasn't necessary, by reusing the existing transform function, but the problem is that we cannot assume that the transform function is not gonna swallow the initial message of a given table, or that it's gonna behave properly with an empty record with a schema.