mute: integrate new MutelistManager

This patch is slightly large (I think still within the guidelines tho) ,
but also pretty straightforward. I thought for a while about how I could
split this up in a straightforward way, and I couldn’t come up with
anything without breaking intermediate builds.

- Deleted a lot of old/unnecessary code (ie. the Collection extension
  for MuteItem, since we’re now using the MutelistManager sets)

- Changed damus_state.contacts to damus_state.mutelist_manager for all
  mute list manager work

- Updated MutelistView to take advantage of new code (this is probably
  the largest change in this patch)

Lighting-Address: fishcharlie@strike.me
Signed-off-by: Charlie Fish <contact@charlie.fish>
Reviewed-by: William Casarin <jb55@jb55.com>
Link: 20240210163650.42884-4-contact@charlie.fish
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Views/SearchHomeView.swift

@@ -59,7 +59,7 @@ struct SearchHomeView: View {
                     return false
                 }
                 
-                let event_muted = damus_state.contacts.mutelist?.mute_list?.event_muted_reason(ev) != nil
+                let event_muted = damus_state.mutelist_manager.is_event_muted(ev)
                 if event_muted {
                     return false
                 }