Voice message recording enhancements (#2042)

* Use Combine to report AudioRecorder state changes

* AudioRecorder is now using AVAudioEngine instead of AVAudioRecorder

* Stop recording when audio configuration changes

* AudioRecorder error handling

* UnitTests

* Use Accelerate to calculate RMS

ElementX/Sources/Services/Audio/AudioSessionProtocol.swift

@@ -0,0 +1,39 @@
+//
+// Copyright 2023 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 AVFoundation
+
+protocol AudioSessionProtocol: AnyObject {
+    func requestRecordPermission(_ response: @escaping (Bool) -> Void)
+    func setAllowHapticsAndSystemSoundsDuringRecording(_ inValue: Bool) throws
+    func setCategory(_ category: AVAudioSession.Category, mode: AVAudioSession.Mode, options: AVAudioSession.CategoryOptions) throws
+    func setActive(_ active: Bool, options: AVAudioSession.SetActiveOptions) throws
+}
+
+extension AudioSessionProtocol {
+    func setCategory(_ category: AVAudioSession.Category, mode: AVAudioSession.Mode) throws {
+        try setCategory(category, mode: mode, options: [])
+    }
+    
+    func setActive(_ active: Bool) throws {
+        try setActive(active, options: [])
+    }
+}
+
+// sourcery: AutoMockable
+extension AudioSessionProtocol { }
+
+extension AVAudioSession: AudioSessionProtocol { }