chore(sdk): Rename SlidingSyncRoom pub(crate) from to pub(super) new.

First off, `SlidingSyncRoom.from` doesn't need to be visible to the entire
crate, only to `crate::sliding_sync.

Second, it's a constructor, so let's call it `new`.

crates/matrix-sdk/src/sliding_sync/mod.rs

@@ -1005,7 +1005,7 @@ impl SlidingSync {
 
                     rooms_map.insert(
                         id.clone(),
-                        SlidingSyncRoom::from(self.client.clone(), id.clone(), room_data, timeline),
+                        SlidingSyncRoom::new(self.client.clone(), id.clone(), room_data, timeline),
                     );
                 }
 

crates/matrix-sdk/src/sliding_sync/room.rs

@@ -49,7 +49,7 @@ impl SlidingSyncRoom {
         }
     }
 
-    pub(crate) fn from(
+    pub(super) fn new(
         client: Client,
         room_id: OwnedRoomId,
         mut inner: v4::SlidingSyncRoom,