Add virtual chat API methods in Shared (#40895)

* move chat stuff to shared

* refactor: using cleanup +whitespaces + xml-doc

* review

---------

Co-authored-by: pa.pecherskij <pa.pecherskij@interfax.ru>

Content.Shared/Chat/SharedChatEvents.cs

@@ -1,12 +1,13 @@
+using Content.Shared.Inventory;
+using Content.Shared.Radio;
 using Content.Shared.Speech;
 using Robust.Shared.Prototypes;
-using Content.Shared.Inventory;
 
 namespace Content.Shared.Chat;
 
 /// <summary>
-///     This event should be sent everytime an entity talks (Radio, local chat, etc...).
-///     The event is sent to both the entity itself, and all clothing (For stuff like voice masks).
+/// This event should be sent everytime an entity talks (Radio, local chat, etc...).
+/// The event is sent to both the entity itself, and all clothing (For stuff like voice masks).
 /// </summary>
 public sealed class TransformSpeakerNameEvent : EntityEventArgs, IInventoryRelayEvent
 {
@@ -22,3 +23,54 @@ public sealed class TransformSpeakerNameEvent : EntityEventArgs, IInventoryRelay
         SpeechVerb = null;
     }
 }
+
+/// <summary>
+/// Raised broadcast in order to transform speech.transmit
+/// </summary>
+public sealed class TransformSpeechEvent : EntityEventArgs
+{
+    public EntityUid Sender;
+    public string Message;
+
+    public TransformSpeechEvent(EntityUid sender, string message)
+    {
+        Sender = sender;
+        Message = message;
+    }
+}
+
+public sealed class CheckIgnoreSpeechBlockerEvent : EntityEventArgs
+{
+    public EntityUid Sender;
+    public bool IgnoreBlocker;
+
+    public CheckIgnoreSpeechBlockerEvent(EntityUid sender, bool ignoreBlocker)
+    {
+        Sender = sender;
+        IgnoreBlocker = ignoreBlocker;
+    }
+}
+
+/// <summary>
+/// Raised on an entity when it speaks, either through 'say' or 'whisper'.
+/// </summary>
+public sealed class EntitySpokeEvent : EntityEventArgs
+{
+    public readonly EntityUid Source;
+    public readonly string Message;
+    public readonly string? ObfuscatedMessage; // not null if this was a whisper
+
+    /// <summary>
+    /// If the entity was trying to speak into a radio, this was the channel they were trying to access. If a radio
+    /// message gets sent on this channel, this should be set to null to prevent duplicate messages.
+    /// </summary>
+    public RadioChannelPrototype? Channel;
+
+    public EntitySpokeEvent(EntityUid source, string message, RadioChannelPrototype? channel, string? obfuscatedMessage)
+    {
+        Source = source;
+        Message = message;
+        Channel = channel;
+        ObfuscatedMessage = obfuscatedMessage;
+    }
+}