Init voice broadcast playing service

RiotSwiftUI/Modules/Room/TimelineVoiceBroadcast/Service/VoiceBroadcastPlaybackServiceProtocol.swift

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+// 
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Combine
+import CoreLocation
+import Foundation
+
+protocol VoiceBroadcastPlaybackServiceProtocol {
+    /// All shared voice broadcast chunks
+    var voiceBroadcastChunks: [VoiceBroadcastChunk] { get }
+    
+    /// Called when voice broadcast chunks are updated.
+    var didUpdateVoiceBroadcastChunks: (([VoiceBroadcastChunk]) -> Void)? { get set }
+    
+    func startPlayingVoiceBroadcast()
+    
+    func pausePlayingVoiceBroadcast()
+}