feat(numberinput): export validateNumberSeparators (#20817)

* feat(numberinput): export validateNumberSeparators

* chore: update snaps

Author: tay1orjones

packages/react/__tests__/__snapshots__/PublicAPI-test.js.snap

@@ -15730,5 +15730,6 @@ Map {
   "usePrefersDarkScheme" => {},
   "usePrefix" => {},
   "useTheme" => {},
+  "validateNumberSeparators" => {},
 }
 `;

packages/react/src/__tests__/index-test.js

@@ -374,6 +374,7 @@ describe('Carbon Components React', () => {
         "usePrefersDarkScheme",
         "usePrefix",
         "useTheme",
+        "validateNumberSeparators",
       ]
     `);
   });

packages/react/src/components/NumberInput/index.ts

@@ -6,4 +6,8 @@
  */
 
 export { default as NumberInputSkeleton } from './NumberInput.Skeleton';
-export { NumberInput, type NumberInputProps } from './NumberInput';
+export {
+  NumberInput,
+  validateNumberSeparators,
+  type NumberInputProps,
+} from './NumberInput';