feat(eventsub): implement clearchat (#5981)

src/providers/twitch/eventsub/MessageHandlers.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "twitch-eventsub-ws/payloads/channel-moderate-v2.hpp"
+
+class QDateTime;
+
+namespace chatterino {
+class TwitchChannel;
+}  // namespace chatterino
+
+namespace chatterino::eventsub {
+
+void handleModerateMessage(
+    TwitchChannel *chan, const QDateTime &time,
+    const lib::payload::channel_moderate::v2::Event &event,
+    const lib::payload::channel_moderate::v2::Clear &action);
+
+}  // namespace chatterino::eventsub