Added esql scalb function.

Author: shmuelhanoch

docs/reference/query-languages/esql/_snippets/functions/description/scalb.md

@@ -592,3 +592,10 @@ s:double | emp_no:integer | salary:integer  | salary_change:double
 -1.0     | 10004          | 36174           | [-0.35, 1.13, 3.65, 13.48]
 -1.0     | 10005          | 63528           | [-2.14, 13.07]
 ;
+
+scalb
+row x = 3.0, y = 10 | eval z = scalb(x, y);
+
+x:double | y:integer | z:double
+3.0      | 10        | 3072.0
+;