feat: Better Polars Schema support
#2703
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… long as --cache-schema is not -1 or -2 and --infer-len is not set to a non-default value (10000)
…fallbacks; remove "fast-path" optimization - use pschema.json file when valid and available - more robust input processing that auto-retries - use pschema if available - if not available, use --infer-len to infer schema - if loading input fails, try to infer schema and load file with inferred schema - if it still fails, scan the whole file to infer the schema and try again - only fail, if all the above fails - removed fast path optimization where we automatically use the read_csv table function when there is only one input, as its prone to failure with real-world data as the read_csv table function only has a default infer-schema length of 100 rows
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schema: add polars schema generation - resolvesschema: add a Polars mode to infer a Polars schema #2700sqlp: major refactoring for better polars schema supportjoinp: will now use an existing valid polars schema so long aspivotpwill now use an existing valid polars schema unless --infer-len is set to a non-default value (10000)