Expose canReach to mob pathfinding API (#10636)

patches/api/Mob-Pathfinding-API.patch

@@ -227,6 +227,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         * @return The closest point the path can get to the target location
 +         */
 +        @Nullable Location getFinalPoint();
++
++        /**
++         * Checks whether the final point can be reached
++         *
++         * @return whether the final point can be reached
++         * @see #getFinalPoint()
++         */
++        boolean canReachFinalPoint();
 +    }
 +}
 diff --git a/src/main/java/org/bukkit/entity/Mob.java b/src/main/java/org/bukkit/entity/Mob.java