WB-784: feat(validator): add 'id' and 'result' to allowed state keys

Expand the set of allowed state keys in `StateConfigValidator` to include 'id' and 'result', enabling additional configuration flexibility.

src/StateConfigValidator.php

@@ -16,7 +16,7 @@ class StateConfigValidator
     ];
 
     private const ALLOWED_STATE_KEYS = [
-        'on', 'states', 'initial', 'type', 'meta', 'entry', 'exit', 'description',
+        'id', 'on', 'states', 'initial', 'type', 'meta', 'entry', 'exit', 'description', 'result',
     ];
 
     private const ALLOWED_TRANSITION_KEYS = [