kraken: csv: move type aliases to 'csv.hh' header

As we need to share it with the CSV writing files.

src/csv/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_library(csv STATIC
+  csv.hh
   read-csv.cc
   read-csv.hh
 )

src/csv/csv.hh

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+namespace kraken::csv {
+
+/// Represent a raw CSV line as a vector of strings.
+using csv_line_type = std::vector<std::string>;
+
+/// Represent a raw CSV file as a vector of raw CSV lines
+using csv_type = std::vector<csv_line_type>;
+
+} // namespace kraken::csv

src/csv/read-csv.hh

@@ -1,8 +1,8 @@
 #pragma once
 
 #include <iosfwd>
-#include <string>
-#include <vector>
+
+#include "csv/csv.hh"
 
 namespace kraken::csv {
 
@@ -14,12 +14,6 @@ enum class CsvHeader {
     KEEP,
 };
 
-/// Represent a raw CSV line as a vector of strings.
-using csv_line_type = std::vector<std::string>;
-
-/// Represent a raw CSV file as a vector of raw CSV lines
-using csv_type = std::vector<csv_line_type>;
-
 /// Parse a CSV file from an input-stream, return a vector of parsed lines.
 csv_type read_csv(std::istream& input, CsvHeader header = CsvHeader::SKIP);