feat: Add Schema and Field withMetadata methods for metadata replacement #334
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What's Changed
Summary:
Field.withMetadata()andSchema.withMetadata()so callers can replace or clear metadata maps without manually juggling Map<string,string> instances. Both helpers accept either a Map, a plain object, or null (to clear), and always return a new instance, matching the C++/PyArrow/Rust behavior.test/unit/schema-tests.tswith coverage for the new helpers. I couldn't find a better place to put these but let me know if I missed something.Closes #333