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/Profile/ProfileView.swift

@@ -179,11 +179,11 @@ struct ProfileView: View {
                     notify(.report(.user(profile.pubkey)))
                 }
 
-                if damus_state.contacts.is_muted(.user(profile.pubkey, nil)) {
+                if damus_state.mutelist_manager.is_muted(.user(profile.pubkey, nil)) {
                     Button(NSLocalizedString("Unmute", comment: "Button to unmute a profile.")) {
                         guard
                             let keypair = damus_state.keypair.to_full(),
-                            let mutelist = damus_state.contacts.mutelist
+                            let mutelist = damus_state.mutelist_manager.event
                         else {
                             return
                         }
@@ -192,7 +192,7 @@ struct ProfileView: View {
                             return
                         }
 
-                        damus_state.contacts.set_mutelist(new_ev)
+                        damus_state.mutelist_manager.set_mutelist(new_ev)
                         damus_state.postbox.send(new_ev)
                     }
                 } else {