feat(cli): STUDIO_PATH environment variable

[imhoffd]

This is a breaking change that removes the windowsAndroidStudioPath and linuxAndroidStudioPath configuration options, combining them into a STUDIO_PATH environment variable, which can be set on any OS.

The naming style of STUDIO_PATH comes from other Android Studio environment variables: https://developer.android.com/studio/command-line/variables

addresses #230 and #2493

[jcesarmobile]

Wasn’t the point of config.js/ts point to be able to use env variables within the files? That would make this PR redundant without the need to use an environment variable of our own

[imhoffd]

This change is addressing the following in the config file proposal:

Android Studio path (and other system paths) should not be a part of the Capacitor config because it is the configuration of the app and not for system settings.