Customize ADB commands timeout

Hi,

On old devices, ADB invocation can be quite long to be executed, more than 5 seconds.
It could be useful to allow overriding the value of 5 seconds. (cf issue #5).

Currently, I edit the dist version of the file (https://github.com/ionic-team/native-run/blob/develop/src/android/utils/adb.ts#L469) in my node_modules to force another value of timeout.

Is there a proper way to pass a param for that. I don't use native-run directly but I use the ionic/cordova stack that use native-run. Maybe an environment variable ?