Merge improved mute functionality from Charlie

This merge adds a bunch of new features from charlie's work on the new
mutelist changes:

- Muted words

- Mute performance optimizations

- New mute list UI

I needed to make a few changes to fix the tests in this merge. Otherwise
it seems to work ok!

Thank to Charlie for getting all of this working after many rounds of
review!

* branch `mute` of https://github.com/damus-io/damus:
  mute: fix bug with duplicate Indefinite items in MuteDurationMenu
  mute: fix mute hashtag from search view if no existing mutelist
  mute: integrate new MutelistManager
  mute: adding MutelistManager.swift
  mute: add maybe_get_content function to NdbNote
  mute: fix bug where mutes can't be added without existing mutelist
  mute: fix issue with not being able to change mute duration
  mute: don't mutate string when adding hashtag
  mute: implement fast MuteItem decoder
  tags: add u64 decoding function
  mute: migrating muted_threads to new mute list
  mute: adding ability to mute hashtag from SearchView
  mute: updating UI to support new mute list
  mute: adding filtering support for MuteItem events
  mute: receiving New Mute List Type
  mute: migrate Lists.swift to use new MuteItem
  mute: add new UI views for new mute list
  mute: adding new structs/enums for new mute list

Changelog-Added: Add ability to mute words, add new mutelist interface (Charlie)

damus/Nostr/NostrEvent.swift

@@ -804,3 +804,15 @@ func to_reaction_emoji(ev: NostrEvent) -> String? {
     }
 }
 
+extension NostrEvent {
+    /// The mutelist for a given event
+    ///
+    /// If the event is not a mutelist it will return `nil`.
+    var mute_list: Set<MuteItem>? {
+        if (self.kind == NostrKind.list_deprecated.rawValue && self.referenced_params.contains(where: { p in p.param.matches_str("mute") })) || self.kind == NostrKind.mute_list.rawValue {
+            return Set(self.referenced_mute_items)
+        } else {
+            return nil
+        }
+    }
+}