Audio and other misc replay related changes (#3471)

Robust.Shared/Replays/IReplayRecordingManager.cs

@@ -0,0 +1,23 @@
+using Robust.Shared.GameObjects;
+
+namespace Robust.Shared.Replays;
+
+public interface IReplayRecordingManager
+{
+    /// <summary>
+    ///     Queues some net-serializable data to be saved for replaying
+    /// </summary>
+    /// <remarks>
+    ///     The queued object is typically something like an <see cref="EntityEventArgs"/>, so that replays can
+    ///     simulate receiving networked messages. However, this can really be any serializable data and could be used
+    ///     for saving server-exclusive data like power net or atmos pipe-net data for replaying. Alternatively, those
+    ///     could also just use networked component states on entities that are in null space and hidden from all
+    ///     players (but still saved to replays).
+    /// </remarks>
+    void QueueReplayMessage(object args);
+
+    /// <summary>
+    ///     Whether the server is currently recording replay data.
+    /// </summary>
+    bool Recording { get; }
+}