feat: add created_by to role_permission table (#5592)

As it says on the tin. In an attempt to make all operations in Unleash
traceable to an originator. This PR adds created_by to role_permission,
which will show which user assigned a permission to a role.

src/migrations/20231211132341-add-created-by-to-role-permission.js

@@ -0,0 +1,7 @@
+exports.up = function(db, cb) {
+  db.runSql(`ALTER TABLE role_permission ADD COLUMN created_by INTEGER`, cb);
+};
+
+exports.down = function(db, cb) {
+  db.runSql(`ALTER TABLE role_permission DROP COLUMN created_by`, cb);
+};