Chat message APIs

MareSynchronosAPI/Data/ChatMessage.cs

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+using MessagePack;
+
+namespace MareSynchronos.API.Data;
+
+[MessagePackObject(keyAsPropertyName: true)]
+public record ChatMessage
+{
+    public string SenderName { get; set; } = string.Empty;
+    public uint SenderHomeWorldId { get; set; } = 0;
+    public byte[] PayloadContent { get; set; } = [];
+}