Hide API keys

[hundredball]

From the Google API alert, the iOS API key of Google Maps is available in the codebase. For the sake of security, we need to hide it somehow as Android.

[hundredball]

In addition to hiding iOS API key, we also need to modify bundle identifier on Android. Modifying bundle identifier on iOS has already done.

[hundredball]

The key for VisionAPI in upload_classification.dart also needs to be hidden.