[C++] Replace RapidJSON with simdjson in JSON parser
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Component: C++
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
Replace the RapidJSON-based JSON parser with simdjson's ondemand API while preserving existing parsing, type inference, schema handling, and error propagation behavior.
Parent Issue: [GH-35460](https://github.com/apache/arrow/issues/35460).
### Component(s)
C++
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