sqlp: derive polars schema from stats cache
#2256
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so we can derive a Polars Schema using a stats cache
as they use stats to derive polars schema
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skipping the need for Polars to scan the CSV for
--infer-lenrows to guess the schema.The guess may turn out to be wrong as the datatype inferences are not guaranteed as it only scans the first
--infer-lenrows, so this not only makes sqlp faster, it makes it more reliable.resolves #2225