Add radio jammer (#14369)

Content.Server/Radio/RadioEvent.cs

@@ -0,0 +1,30 @@
+using Content.Shared.Chat;
+using Content.Shared.Radio;
+
+namespace Content.Server.Radio;
+
+[ByRefEvent]
+public readonly record struct RadioReceiveEvent(string Message, EntityUid MessageSource, RadioChannelPrototype Channel, MsgChatMessage ChatMsg);
+
+/// <summary>
+/// Use this event to cancel sending message per receiver
+/// </summary>
+[ByRefEvent]
+public record struct RadioReceiveAttemptEvent(RadioChannelPrototype Channel, EntityUid RadioSource, EntityUid RadioReceiver)
+{
+    public readonly RadioChannelPrototype Channel = Channel;
+    public readonly EntityUid RadioSource = RadioSource;
+    public readonly EntityUid RadioReceiver = RadioReceiver;
+    public bool Cancelled = false;
+}
+
+/// <summary>
+/// Use this event to cancel sending message to every receiver
+/// </summary>
+[ByRefEvent]
+public record struct RadioSendAttemptEvent(RadioChannelPrototype Channel, EntityUid RadioSource)
+{
+    public readonly RadioChannelPrototype Channel = Channel;
+    public readonly EntityUid RadioSource = RadioSource;
+    public bool Cancelled = false;
+}