在Application里面对Flutter boost进行初始化之后，然后从原生跳转到Flutter_module项目时会有一段时间白屏或者黑屏的问题，希望可以优化一下

## Steps to Reproduce
**A small application to reproduce the bug(最小化可复现的demo)**

1. ...
2. ...
3. ...

**Flutter Boost Version**
**Target Platform:**
**Target OS version/browser:**
**Devices:**

## Logs
add your crash log or something else.

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No files, tests, platform details, or reproducible steps are provided. Start by reproducing the transition after Flutter Boost initialization in the Application and from the native app to Flutter_module, then trace the relevant startup and navigation entry points. Done means the white or black interval is reduced or eliminated during that transition.

Written by the indexing model from the issue text.