open
Opens the system battery-optimization list so the user can mark this app as "not optimized" / "unrestricted". Play-safe (no special permission). Falls back to the app's details screen if the dedicated screen is unavailable on the device. Pass an Activity context where possible; a non-Activity context works because FLAG_ACTIVITY_NEW_TASK is added.
Return
true if a settings screen was launched, false if the device exposed neither (rare).