enable unreachable_pub lint

This causes some other lints to start firing too (which is good), but
I'm going to fix them in follow-up commits to keep things organized.

src/service/rooms/directory.rs

@@ -1,32 +1,32 @@
 mod data;
 
-pub use data::Data;
+pub(crate) use data::Data;
 use ruma::{OwnedRoomId, RoomId};
 
 use crate::Result;
 
-pub struct Service {
-    pub db: &'static dyn Data,
+pub(crate) struct Service {
+    pub(crate) db: &'static dyn Data,
 }
 
 impl Service {
     #[tracing::instrument(skip(self))]
-    pub fn set_public(&self, room_id: &RoomId) -> Result<()> {
+    pub(crate) fn set_public(&self, room_id: &RoomId) -> Result<()> {
         self.db.set_public(room_id)
     }
 
     #[tracing::instrument(skip(self))]
-    pub fn set_not_public(&self, room_id: &RoomId) -> Result<()> {
+    pub(crate) fn set_not_public(&self, room_id: &RoomId) -> Result<()> {
         self.db.set_not_public(room_id)
     }
 
     #[tracing::instrument(skip(self))]
-    pub fn is_public_room(&self, room_id: &RoomId) -> Result<bool> {
+    pub(crate) fn is_public_room(&self, room_id: &RoomId) -> Result<bool> {
         self.db.is_public_room(room_id)
     }
 
     #[tracing::instrument(skip(self))]
-    pub fn public_rooms(&self) -> impl Iterator<Item = Result<OwnedRoomId>> + '_ {
+    pub(crate) fn public_rooms(&self) -> impl Iterator<Item = Result<OwnedRoomId>> + '_ {
         self.db.public_rooms()
     }
 }