feat(Discover): add Timeline to trending links

Adds a timeline of statuses that posted about a trending link.
See https://github.com/mastodon/mastodon/pull/30381 for more details.

mastodon/src/main/res/menu/trending_links_timeline.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/open_link"
+        android:icon="@drawable/ic_fluent_document_one_page_24_filled"
+        android:showAsAction="always"
+        android:title="@string/mo_trending_link_read"/>
+</menu>