Fix: console.log need to print UTF-8 string

Add support for UTF-8 string in console.log.

```
console.log("日本語の表示テスト");
```

Before:
```
[INFO]  |------- simulator log started -------|
[INFO]  Êó•Êú¨Ë™û„ÅÆË°®Á§∫„ÉÜ„Çπ„Éà
[INFO]  Application windows are expected to have a root view controller at the end of application launch
[INFO]  |------- simulator log finished -------|
```

After:
```
[INFO]  |------- simulator log started -------|
[INFO]  日本語の表示テスト
[INFO]  Application windows are expected to have a root view controller at the end of application launch
[INFO]  |------- simulator log finished -------|
```