Add API methods to control if armor stands can move

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftArmorStand.java

@@ -222,4 +222,15 @@ public class CraftArmorStand extends CraftLivingEntity implements ArmorStand {
     public boolean hasEquipmentLock(EquipmentSlot equipmentSlot, LockType lockType) {
         return (this.getHandle().disabledSlots & (1 << CraftEquipmentSlot.getNMS(equipmentSlot).getFilterBit(lockType.ordinal() * 8))) != 0;
     }
+    // Paper start
+    @Override
+    public boolean canMove() {
+        return getHandle().canMove;
+    }
+
+    @Override
+    public void setCanMove(boolean move) {
+        getHandle().canMove = move;
+    }
+    // Paper end
 }