Migrate /clear command to Helix API (#3994)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/providers/twitch/api/Helix.hpp

@@ -329,6 +329,17 @@ enum class HelixUpdateUserChatColorError {
     Forwarded,
 };
 
+enum class HelixDeleteChatMessagesError {
+    Unknown,
+    UserMissingScope,
+    UserNotAuthenticated,
+    UserNotAuthorized,
+    MessageUnavailable,
+
+    // The error message is forwarded directly from the Twitch API
+    Forwarded,
+};
+
 class IHelix
 {
 public:
@@ -458,6 +469,13 @@ public:
         FailureCallback<HelixUpdateUserChatColorError, QString>
             failureCallback) = 0;
 
+    // https://dev.twitch.tv/docs/api/reference#delete-chat-messages
+    virtual void deleteChatMessages(
+        QString broadcasterID, QString moderatorID, QString messageID,
+        ResultCallback<> successCallback,
+        FailureCallback<HelixDeleteChatMessagesError, QString>
+            failureCallback) = 0;
+
     virtual void update(QString clientId, QString oauthToken) = 0;
 };
 
@@ -580,6 +598,13 @@ public:
         FailureCallback<HelixUpdateUserChatColorError, QString> failureCallback)
         final;
 
+    // https://dev.twitch.tv/docs/api/reference#delete-chat-messages
+    void deleteChatMessages(
+        QString broadcasterID, QString moderatorID, QString messageID,
+        ResultCallback<> successCallback,
+        FailureCallback<HelixDeleteChatMessagesError, QString> failureCallback)
+        final;
+
     void update(QString clientId, QString oauthToken) final;
 
     static void initialize();