default Tuple2<Seq<T>, Seq<T>> splitAt(long position) {
        return splitAt(this, position);
    }
Split a stream at a given position.
<p>
<pre><code>
// tuple((1, 2, 3), (4, 5, 6))
Seq.of(1, 2, 3, 4, 5, 6).splitAt(3)
</code></pre>

@see #splitAt(Stream, long)
jOOL/src/main/java/org/jooq/lambda/Seq.java