Implement Android-native Connection Assist UI

...x/app/src/main/java/org/mozilla/fenix/BrowserDirection.kt

fenix/app/src/main/java/org/mozilla/fenix/HomeActivity.kt

...java/org/mozilla/fenix/tor/TorConnectionAssistFragment.kt

...ava/org/mozilla/fenix/tor/TorConnectionAssistViewModel.kt

.../app/src/main/java/org/mozilla/fenix/tor/TorController.kt

...p/src/main/java/org/mozilla/fenix/tor/TorControllerTAS.kt

fenix/app/src/main/res/drawable/connect.xml

fenix/app/src/main/res/drawable/progress_gradient.xml

...pp/src/main/res/layout/fragment_tor_connection_assist.xml

fenix/app/src/main/res/layout/tor_bootstrap_connect.xml

fenix/app/src/main/res/navigation/nav_graph.xml

fenix/app/src/main/res/values/colors.xml

fenix/app/src/main/res/values/torbrowser_strings.xml