chore: add migration for adding created_by to feature_strategies table (#5589)

## About the changes

Contains the migration that adds the column created_by to
`feature_strategies`

src/migrations/20231211122426-feature-strategies-created-by.js

@@ -0,0 +1,19 @@
+'use strict';
+
+exports.up = function (db, callback) {
+    db.runSql(
+        `
+        ALTER TABLE feature_strategies ADD COLUMN IF NOT EXISTS created_by INTEGER;
+        `,
+        callback,
+    );
+};
+
+exports.down = function (db, callback) {
+    db.runSql(
+        `
+        ALTER TABLE feature_strategies DROP COLUMN IF EXISTS created_by;
+        `,
+        callback,
+    );
+};