[MLv2] Expose field_id mlv2 function (#33021)

* expose field_id mlv2 function

* Update frontend/src/metabase-lib/fields.ts

Co-authored-by: Anton Kulyk <kuliks.anton@gmail.com>

---------

Co-authored-by: Anton Kulyk <kuliks.anton@gmail.com>

frontend/src/metabase-lib/fields.ts

@@ -19,3 +19,14 @@ export function fieldableColumns(
 ): ColumnMetadata[] {
   return ML.fieldable_columns(query, stageIndex);
 }
+
+/**
+ * This should only be used to get field IDs when it is necessary, like interacting with backend API parameters.
+ * For most purposes, you should be use columnMetadata objects and not access field ids directly
+ *
+ * @param {ColumnMetadata} column
+ * @returns {number|null} field id
+ */
+export function _fieldId(column: ColumnMetadata): number | null {
+  return ML.field_id(column);
+}