smaller PR for parquet
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- Fixed JSON parsing error when persisting state
- Added unit tests for schema evolution
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@the-other-tim-brown I marked as resolved all of your addressed reviews and comments here. To me except few other minor comments here, the main work still to be done is adding the test for the file schema through seperate methods for the statsExtractor. In a subsequent update we could adress further minor issues with this code.
@the-other-tim-brown all of your reviews hav been addressed and the updates have been pushed.
Adds converters for #553