Add native JSON load with arrow::json / RapidJSON
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scaffold json methods scaffold on the arrow json loader Add benchmark support, add python tests, add JSON array -> JSONL converter
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This PR adds support for loading/updating JSON strings directly. It uses the arrow JSON loader (similar to the current CSV loading). The native arrow JSON loading only supports JSONL/NDJSON format, so this also adds a small code block to convert a JSON array (
[{ ...}, {...}]) into a JSONL ({...}\n{...}\n).