Most demos crash due to not finding Streets layer

Nobody has claimed this yet.

When I run the demo (after setting `maptilerApiKey` in `local.properties`), the vast majority of the samples in the sample app fail with this exception:

```
FATAL EXCEPTION: main
Process: org.maplibre.android.plugins.testapp, PID: 14496
java.lang.IllegalArgumentException: Could not find layer Streets
at org.maplibre.android.maps.Style.getPredefinedStyle(Style.java:1430)
at org.maplibre.android.plugins.testapp.activity.annotation.CircleActivity.lambda$onCreate$4$org-maplibre-android-plugins-testapp-activity-annotation-CircleActivity(CircleActivity.java:48)
at org.maplibre.android.plugins.testapp.activity.annotation.CircleActivity$$ExternalSyntheticLambda4.onMapReady(Unknown Source:4)
at org.maplibre.android.maps.MapView$MapCallback.onMapReady(MapView.java:1324)
```

if I instead edit `PluginApplication` and update:

```
MapLibre.getInstance(this)
```

to

```
MapLibre.getInstance(this, BuildConfig.MAPTILER_API_KEY, WellKnownTileServer.MapTiler)
```

many of the demos work, (though others crash still with the same exception with layer `Outdoors` instead of `Streets`). Is there any piece of setup I am missing here?

Also, is `mapbox_access_token` actually used? I set it, but I don't see anything in the code that reads it (neither in this repo nor in maplibre-native, minus some of their sample code).

Thanks!

Start with PluginApplication and the failing demo entry point CircleActivity, then trace the MapLibre.getInstance configuration and the predefined Streets and Outdoors layer lookups shown in the stack trace. Check how maptilerApiKey and mapbox_access_token from local.properties are consumed. Done means the sample demos no longer fail because those layers cannot be found, and the token configuration behavior is understood.

Written by the indexing model from the issue text.