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/search.rs

@@ -1,22 +1,27 @@
 mod data;
 
-pub use data::Data;
+pub(crate) use data::Data;
 
 use crate::Result;
 use ruma::RoomId;
 
-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 index_pdu<'a>(&self, shortroomid: u64, pdu_id: &[u8], message_body: &str) -> Result<()> {
+    pub(crate) fn index_pdu<'a>(
+        &self,
+        shortroomid: u64,
+        pdu_id: &[u8],
+        message_body: &str,
+    ) -> Result<()> {
         self.db.index_pdu(shortroomid, pdu_id, message_body)
     }
 
     #[tracing::instrument(skip(self))]
-    pub fn search_pdus<'a>(
+    pub(crate) fn search_pdus<'a>(
         &'a self,
         room_id: &RoomId,
         search_string: &str,