Distinguishing states when session is started

Nobody has claimed this yet.

**Mapbox Navigation SDK version:**
qa_release_core_1.0.0-qa.2020w27
qa_release_ui_1.0.0-qa.2020w27

### Issue
The states available in Navigation-Core for Free Drive and Active Guidance is [TripSessionState](https://github.com/mapbox/mapbox-navigation-android/blob/82785402548dae40ec7b6000308ab2b5b8f22f93/libnavigation-core/src/main/java/com/mapbox/navigation/core/trip/session/TripSessionState.kt#L6-L16) and [getRoutes](https://github.com/mapbox/mapbox-navigation-android/blob/82785402548dae40ec7b6000308ab2b5b8f22f93/libnavigation-core/src/main/java/com/mapbox/navigation/core/MapboxNavigation.kt#L286).

When a session is STARTED, there are only 2 states available in navigation core. All the examples have these states, but are not handling them directly. This makes it difficult to [restore state on configuration changes](https://github.com/mapbox/navigation-sdks/issues/402)

| Free Drive | Set route (?) | Active guidance |
| -- | -- | -- |
|  |  |  |

### Solutions

1tap is solving this with a [NavigationViewsState](https://github.com/mapbox/1tap-android/blob/2ddc0daf437c5f3c44770dce2c2042120e85f1f2/navigation/src/main/java/com/mapbox/onetap/navigation/route/domain/NavigationViewsState.kt#L12-L32)

Navigation-UI stores a "navigation_running" key and restores it onCreate inside [NavigationView](https://github.com/mapbox/mapbox-navigation-android/blob/82785402548dae40ec7b6000308ab2b5b8f22f93/libnavigation-ui/src/main/java/com/mapbox/navigation/ui/NavigationView.java#L802-L808)

### Next steps

All the examples are working around this problem by subscribing to the LocationEngine separately, and they're not starting the session right away. Considering solutions for all of our [core examples](https://github.com/mapbox/mapbox-navigation-android/tree/master/examples/src/main/java/com/mapbox/navigation/examples/core)

Start with TripSessionState.kt and MapboxNavigation.kt to understand the existing session and route states, then compare the restoration logic in NavigationView.java and the core examples. Review the linked configuration-change context and determine a consistent state model and example handling; done means session states can be distinguished and restored without the current LocationEngine workaround.

Written by the indexing model from the issue text.