feat(spark): dialect YAML file for spark converter #554
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Adds the formal dialect definition for the Spark converter. The file is generated from code which extracts the relevant information from the exisitng FunctionMapper definitions. This ensures that the dialect YAML remains in-sync with the code.
Tests have been introduced to ensure that the dialect conforms to the schema (defined in teh base substrait library), and that the published dialect YAML is the equivalent to one that would be generated from the current code.