fix(cpp): declare CsvChunkReader methods in header and fix scan_schema member accesses

Author: im-anishraj

cpp/include/arnio/csv_reader.h

@@ -87,6 +87,11 @@ class CsvChunkReader {
     explicit CsvChunkReader(const CsvConfig& config = CsvConfig{});
     ~CsvChunkReader();
 
+    void open(const std::string& path);
+    std::optional<CsvParseResult> next_chunk(size_t chunksize,
+                                             const std::string& on_bad_lines = "error");
+    void close();
+
     // Infer DType from a string value
     DType infer_type(const std::string& value) const;
 

cpp/src/csv_reader.cpp

@@ -1180,9 +1180,9 @@ CsvReader::scan_schema(const std::string& path, const std::string& on_bad_lines)
 
     if (record_reader.read(line)) {
         strip_utf8_bom(line);
-        header = parse_line(line);
+        header = parser_.parse_line(line);
         for (auto& h : header) {
-            if (config_.trim_headers) trim_in_place(h);
+            if (config.trim_headers) trim_in_place(h);
         }
     }