Implemented dynamic dispatch table for several distance backend optimizations

Author: marcobambini

src/distance-avx2.c

@@ -0,0 +1,15 @@
+//
+//  distance-avx2.h
+//  sqlitevector
+//
+//  Created by Marco Bambini on 20/06/25.
+//
+
+#ifndef __VECTOR_DISTANCE_AVX2__
+#define __VECTOR_DISTANCE_AVX2__
+
+#include <stdio.h>
+
+void init_distance_functions_avx2 (void);
+
+#endif