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/Models/SearchModel.swift

@@ -28,7 +28,7 @@ class SearchModel: ObservableObject {
     
     func filter_muted()  {
         self.events.filter {
-            should_show_event(contacts: state.contacts, ev: $0)
+            should_show_event(state: state, ev: $0)
         }
         self.objectWillChange.send()
     }
@@ -57,7 +57,7 @@ class SearchModel: ObservableObject {
             return
         }
         
-        guard should_show_event(contacts: state.contacts, ev: ev) else {
+        guard should_show_event(state: state, ev: ev) else {
             return
         }