Add list timelines view

* get accounts list timelines from API
* display available lists in discover view tab
* display list timeline

mastodon/src/main/res/layout/item_list_timeline.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="64dp"
+    android:paddingLeft="16dp"
+    android:paddingRight="16dp"
+    android:paddingTop="12dp">
+
+    <TextView
+        android:id="@+id/title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textAppearance="@style/m3_title_large"
+        android:singleLine="true"
+        android:ellipsize="end"
+        tools:text="List"/>
+
+</RelativeLayout>