feat(mac,ios,playback,store): initial macos implementation

Packages/AmphlifyKit/Sources/Store/Library.swift

@@ -5,7 +5,24 @@ public enum AlbumSort: String, CaseIterable, Sendable {
     case recentlyAdded, title, artist, year
 }
 
+public enum SearchHit: Identifiable, Hashable, Codable, Sendable {
+    case artist(Artist)
+    case album(Album)
+    case track(Track)
+    case playlist(Playlist)
+
+    public var id: EntityID {
+        switch self {
+        case let .artist(artist): artist.id
+        case let .album(album): album.id
+        case let .track(track): track.id
+        case let .playlist(playlist): playlist.id
+        }
+    }
+}
+
 public struct SearchResults: Sendable {
+    public var top: [SearchHit] = []
     public var artists: [Artist] = []
     public var albums: [Album] = []
     public var tracks: [Track] = []