LibWebView+Services+UI: Move the EventLoop implementations to LibWebView

We currently compile the Qt event loop files multiple times, for every
target which wants to use them. This patch moves these to LibWebView as
a central location to avoid this.

Libraries/LibWebView/EventLoop/EventLoopImplementationQtEventTarget.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2023, Gregory Bertilson <zaggy1024@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <QEvent>
+#include <QObject>
+
+namespace WebView {
+
+class EventLoopImplementationQtEventTarget final : public QObject {
+    Q_OBJECT
+
+public:
+    virtual bool event(QEvent* event) override;
+};
+
+}