Room list: tweak UI and add overflow menu with report bug and invite friends action.

Extract invite friends action to a use case to avoid copy paste.

features/roomlist/api/src/main/kotlin/io/element/android/features/roomlist/api/RoomListEntryPoint.kt

@@ -37,6 +37,7 @@ interface RoomListEntryPoint : FeatureEntryPoint {
         fun onSessionVerificationClicked()
         fun onInvitesClicked()
         fun onRoomSettingsClicked(roomId: RoomId)
+        fun onReportBugClicked()
     }
 }