migrated CDataWGo into new package

Migrated as executable target. This makes the target executable from the command line using swift run go-swift.
The idea is to make a pre-build plugin and use it before test launch

Author: morenonicolelli

CDataWGo/Package.swift

@@ -67,6 +67,12 @@ let package = Package(
                 // build: .unsafeFlags(["-warnings-as-errors"])
             ]
         ),
+        .executableTarget(
+            name: "go-swift",
+            dependencies: [
+                .target(name: "Arrow"),
+            ]
+        ),
         .testTarget(
             name: "ArrowTests",
             dependencies: ["Arrow", "ArrowC"],

Package.swift

@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "../../Arrow/Sources/ArrowC/include/ArrowCData.h"
+#include "../ArrowC/include/ArrowCData.h"
 
 void stringTypeFromSwift(struct ArrowSchema*);
 
@@ -27,4 +27,4 @@ void arrayStringFromSwift(struct ArrowArray*);
 
 void arrayIntToSwift(struct ArrowArray* array);
 
-void arrayStringToSwift(struct ArrowArray* array);
+void arrayStringToSwift(struct ArrowArray* array);