ExecutionPlan.toJsonList add documentation

[github-actions[bot]]

ExecutionPlan.toJsonList add documentation

labels:documentation,todo

@return

https://github.com/apache/incubator-wayang/blob/fe066b31d72e8789886aa1217f2516c576195a32/wayang-commons/wayang-core/src/main/java/org/apache/wayang/core/plan/executionplan/ExecutionPlan.java#L99

        return sb.toString();
    }

    /**
     * TODO: ExecutionPlan.toJsonList add documentation
     * labels:documentation,todo
     *
     * @return
     */
    public List<Map> toJsonList() {
        Counter<ExecutionStage> stageActivationCounter = new Counter<>();
        Queue<ExecutionStage> activatedStages = new LinkedList<>(this.startingStages);

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