Create cbrt (cube root) UDF

returns the cube root of a double value
cbrt(double a) : double

For example:

select cbrt(87860583272930481.0);
OK
444561.0

I noticed that Math.pow(a, 1.0/3.0) and hive power UDF return 444560.99999999965 for the example above.
However Math.cbrt returns 444561.0
This is why we should have hive cbrt function in hive