请问一下，集成FlutterBoost后，我要在Flutter项目全局性的监听BoostChannel的初始化工作，在哪里做合适呢？

请问一下，集成FlutterBoost后，我要在Flutter项目中，启动后全局监听BoostChannel，即BoostChannel.instance.addEventListener，在哪里做比较合适呢？
有尝试在MyAppState.initState，会报错null异常，也就是BoostChannel.appState还没有初始化成功而报错

Start by tracing BoostChannel.appState initialization and the BoostChannel.instance.addEventListener call in relation to MyAppState.initState. Confirm the lifecycle ordering that causes the null exception, then document or implement the appropriate initialization point and verify that global event listening works after FlutterBoost startup.

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