Add initial impute transform support #147
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Overview
This PR adds support for evaluating certain configurations of the Vega
imputetransform in the VegaFusion Runtime. This initial implementation aims to support Vega-Lite's use ofimputewhen generating stacked area charts.Limitations
This implementation only supports the following subset of the functionality of
imputemethodmust be 'value'groupbymust be a list of zero or one field.Other uses of impute are detected and the planner pushes them into the client specification