Switch to unified timeline cache via TimelineKinds

This is a fairly large rewrite which unifies our threads, timelines and
profiles. Now all timelines have a MultiSubscriber, and can be added
and removed to columns just like Threads and Profiles.

Signed-off-by: William Casarin <jb55@jb55.com>

crates/enostr/src/note.rs

@@ -9,7 +9,7 @@ pub struct NoteId([u8; 32]);
 
 impl fmt::Debug for NoteId {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.hex())
+        write!(f, "NoteId({})", self.hex())
     }
 }