Returns its arguments formatted into a string (varchar), like
the equivalent Vortex function <strfmt> (based on the C
function sprintf()):
stringformat(format[, arg[, arg[, arg[, arg]]]])
The format argument is a varchar string that describes
how to print the following argument(s), if any. See the Vortex manual
for <strfmt> for details. Added in version 6.00.1300386000
20110317. In version 8.01.1680112312 20230329 and later, a max of 10
arguments (including format) instead of 5 are supported.