Add Security Level UI

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

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

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

app/src/main/res/layout/tor_onboarding_security_level.xml

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

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

app/src/main/res/xml/preferences.xml

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