Add a `transpose` Java goody

I'm thinking it would be neat to make this "lazy", i.e. have it backed by the same data as the original.

A possible API:

```java
int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
List> transposedMatrix = transpose(matrix);

System.out.println(transposedMatrix); // should print [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
```

The implementation could use the `VirtualList` goody to achieve this effect.