ListMonad bind draft implementation

bind.java

    @Override
    public <B, M extends Monad<B>> M bind(Function<A, M> fn) {
	List<B> result = new ArrayList<>();
	for(A v : this.getTypedRef().getValue()) {
		ListMonad<B> partialMonad = (ListMonad<B>) fn.apply(v);
		result.addAll(partialMonad.getTypedRef().getValue());
	}
	return (M) result;
    }