Message metadata events

SlackNet/Events/MessageMetadataDeleted.cs

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+namespace SlackNet.Events;
+
+/// <summary>
+/// Sent when a message's metadata has been deleted.
+/// Within the payload there will be a <see cref="PreviousMetadata"/> property notifying you of what has been deleted.
+/// </summary>
+public class MessageMetadataDeleted : Event
+{
+    public MessageMetadata PreviousMetadata { get; set; }
+    public string AppId { get; set; }
+    public string BotId { get; set; }
+    public string UserId { get; set; }
+    public string TeamId { get; set; }
+    public string ChannelId { get; set; }
+    public string MessageTs { get; set; }
+    public string DeletedTs { get; set; }
+}

SlackNet/Events/MessageMetadataPosted.cs

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+namespace SlackNet.Events;
+
+/// <summary>
+/// Sent when a message containing metadata is sent in Slack.
+/// </summary>
+public class MessageMetadataPosted : Event
+{
+    public MessageMetadata Metadata { get; set; }
+    public string AppId { get; set; }
+    public string BotId { get; set; }
+    public string UserId { get; set; }
+    public string TeamId { get; set; }
+    public string ChannelId { get; set; }
+    public string MessageTs { get; set; }
+}

SlackNet/Events/MessageMetadataUpdated.cs

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+namespace SlackNet.Events;
+
+/// <summary>
+/// Sent when a message's metadata has been updated.
+/// Within the payload you'll notice an extra <see cref="PreviousMetadata"/> in addition to the <see cref="Metadata"/> property, notifying you of what was changed.
+/// </summary>
+public class MessageMetadataUpdated : Event
+{
+    public MessageMetadata PreviousMetadata { get; set; }
+    public MessageMetadata Metadata { get; set; }
+    public string AppId { get; set; }
+    public string BotId { get; set; }
+    public string UserId { get; set; }
+    public string TeamId { get; set; }
+    public string ChannelId { get; set; }
+    public string MessageTs { get; set; }
+}