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* feat: serialize struct to json in postgres * fix: support view scalars and preserve null structs in scalar-to-value conversion Address PR review: - Utf8View/BinaryView ScalarValues now convert like their non-view forms instead of failing row extraction for struct columns - a null struct scalar converts to Value::Null so a null struct inside a list stays null in the serialized JSON Signed-off-by: Ning Sun <sunning@greptime.com> * fix: return errors instead of panics for unsupported arrow field types Struct-typed query results with arrow field types greptimedb cannot represent (e.g. Decimal256) used to panic during schema conversion and row extraction, dropping the client connection. They now surface as query errors: - ConcreteDataType::try_from builds struct types fallibly via the new StructType::try_from_arrow_fields - Value::try_from(ScalarValue::Struct) uses the same fallible path - new try_value_from_array converts an arrow element to Value with error propagation, used by the postgres struct encoding Signed-off-by: Ning Sun <sunning@greptime.com> --------- Signed-off-by: Ning Sun <sunning@greptime.com>