[WIP] Add all extensions

Telegram/NotificationService/Sources/TelegramChannel.swift

@@ -0,0 +1,38 @@
+import PostboxDataTypes
+import PostboxCoding
+
+public enum TelegramChannelInfo: Int32 {
+    case broadcast = 0
+    case group = 1
+}
+
+public final class TelegramChannel: Peer {
+    public let id: PeerId
+    public let username: String?
+    public let info: TelegramChannelInfo
+    
+    public let associatedPeerId: PeerId? = nil
+    public let notificationSettingsPeerId: PeerId? = nil
+    
+    public init(decoder: PostboxDecoder) {
+        self.id = PeerId(decoder.decodeInt64ForKey("i", orElse: 0))
+        self.username = decoder.decodeOptionalStringForKey("un")
+        self.info = TelegramChannelInfo(rawValue: decoder.decodeInt32ForKey("i.t", orElse: 0)) ?? .broadcast
+    }
+    
+    public func encode(_ encoder: PostboxEncoder) {
+        preconditionFailure()
+    }
+    
+    public func isEqual(_ other: Peer) -> Bool {
+        guard let other = other as? TelegramChannel else {
+            return false
+        }
+        
+        if self.username != other.username {
+            return false
+        }
+        
+        return true
+    }
+}