fixup! Add Tor integration and UI

Bug 42248: Allow GeckoView to launch tor

Add a torrc-defaults with the configuration of pluggable transports.
We should remove it once we remove tor-android-service and
tor-onion-proxy-library, and include it in their replacement.

fenix/app/src/main/assets/common/torrc-defaults

+## torrc-defaults for Tor Browser for Android
+AvoidDiskWrites 1
+# (stderr|stdout|syslog|file FILENAME).
+Log notice stdout
+CookieAuthentication 1
+DormantCanceledByStartup 1
+ClientTransportPlugin meek_lite,obfs2,obfs3,obfs4,scramblesuit exec ./libObfs4proxy.so
+ClientTransportPlugin snowflake exec ./libSnowflake.so
+ClientTransportPlugin webtunnel exec ./libWebtunnel.so
+ClientTransportPlugin conjure exec ./libConjure.so -registerURL https://registration.refraction.network/api