Added esql scalb function. (elastic#127696)

Co-authored-by: Shmuel Hanoch <[email protected]>

Author: shmuelhanoch

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

@@ -16,6 +16,7 @@
 * [`PI`](../../functions-operators/math-functions.md#esql-pi)
 * [`POW`](../../functions-operators/math-functions.md#esql-pow)
 * [`ROUND`](../../functions-operators/math-functions.md#esql-round)
+* [`SCALB`](../../functions-operators/math-functions.md#esql-scalb)
 * [`SIGNUM`](../../functions-operators/math-functions.md#esql-signum)
 * [`SIN`](../../functions-operators/math-functions.md#esql-sin)
 * [`SINH`](../../functions-operators/math-functions.md#esql-sinh)

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

@@ -66,6 +66,9 @@ mapped_pages:
 :::{include} ../_snippets/functions/layout/round.md
 :::
 
+:::{include} ../_snippets/functions/layout/scalb.md
+:::
+
 :::{include} ../_snippets/functions/layout/signum.md
 :::