TB 41878: [android] Add standalone Tor Bootstrap

...va/mozilla/components/browser/engine/gecko/GeckoEngine.kt

mobile/android/fenix/app/build.gradle

...e/android/fenix/app/src/main/assets/common/torrc-defaults

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

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

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

.../src/main/java/org/mozilla/fenix/components/Components.kt

...rc/main/java/org/mozilla/fenix/tor/TorBridgeTransports.kt

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

...pp/src/main/java/org/mozilla/fenix/tor/TorControllerGV.kt

...d/fenix/app/src/main/java/org/mozilla/fenix/tor/TorLog.kt

...c/main/res/drawable/tor_bootstrap_background_gradient.xml

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

mobile/android/fenix/app/src/main/res/values/styles.xml