for multisell implementation in server code

datapack_development/data/multisell.csv

@@ -0,0 +1,3 @@
+#listid;itemid;final_count;ing_count;id,count,enchant,id,count,enchant,id,count,enchant
+1;10;1;2;12,1,0,13,1,1
+1;364;2;2;10,1,2,14,1,0