Add flag to only pull APK from phone if it is already installed

[conorgil]

As written, if an APK with the given package ID is already installed on the phone, then the script will pull it from the phone onto the laptop. However, if such an APK is not installed, then it will automatically open the Google Play store, install the APK, and then pull it from the phone to the laptop.

There are use-cases where installing the app is not desirable if it is not already installed.

Add a flag such that the APK will only be pulled from the phone if it is present and it WILL NOT be installed if it is not present.

Something like --skip-install or --pull-only