[android] Add Security Level UI

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

...src/main/java/org/mozilla/fenix/IntentReceiverActivity.kt

...ix/app/src/main/java/org/mozilla/fenix/components/Core.kt

...lla/fenix/home/sessioncontrol/SessionControlController.kt

...lla/fenix/home/sessioncontrol/SessionControlInteractor.kt

...olders/onboarding/TorOnboardingSecurityLevelViewHolder.kt

.../main/java/org/mozilla/fenix/settings/SettingsFragment.kt

...va/org/mozilla/fenix/settings/TorSecurityLevelFragment.kt

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

...nix/app/src/main/java/org/mozilla/fenix/utils/Settings.kt

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

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

mobile/android/fenix/app/src/main/res/xml/preferences.xml

...x/app/src/main/res/xml/tor_security_level_preferences.xml