Enable lifecycle autotracking by default

[matus-tomlein]

Up to the v5 version of the tracker, lifecycle autotracking is not enabled by default. However, lifecycle events are crucial to understand the usage of the app and user engagement. It is not possible to calculate screen time without knowing whether the app is in foreground or background.

As we are introducing screen engagement tracking in the v6 version which will be enabled by default, we should also enable lifecycle tracking by default.