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/metadata.rs

@@ -1,30 +1,30 @@
 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 {
     /// Checks if a room exists.
     #[tracing::instrument(skip(self))]
-    pub fn exists(&self, room_id: &RoomId) -> Result<bool> {
+    pub(crate) fn exists(&self, room_id: &RoomId) -> Result<bool> {
         self.db.exists(room_id)
     }
 
-    pub fn iter_ids<'a>(&'a self) -> Box<dyn Iterator<Item = Result<OwnedRoomId>> + 'a> {
+    pub(crate) fn iter_ids<'a>(&'a self) -> Box<dyn Iterator<Item = Result<OwnedRoomId>> + 'a> {
         self.db.iter_ids()
     }
 
-    pub fn is_disabled(&self, room_id: &RoomId) -> Result<bool> {
+    pub(crate) fn is_disabled(&self, room_id: &RoomId) -> Result<bool> {
         self.db.is_disabled(room_id)
     }
 
-    pub fn disable_room(&self, room_id: &RoomId, disabled: bool) -> Result<()> {
+    pub(crate) fn disable_room(&self, room_id: &RoomId, disabled: bool) -> Result<()> {
         self.db.disable_room(room_id, disabled)
     }
 }