LibDevTools: Begin supporting the JavaScript console

This implements enough to execute JavaScript and reply with the result.
We do not yet support autocomplete or eager evaluation.

Libraries/LibDevTools/Actors/ConsoleActor.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/NonnullRefPtr.h>
+#include <LibDevTools/Actor.h>
+
+namespace DevTools {
+
+class ConsoleActor final : public Actor {
+public:
+    static constexpr auto base_name = "console"sv;
+
+    static NonnullRefPtr<ConsoleActor> create(DevToolsServer&, String name, WeakPtr<TabActor>);
+    virtual ~ConsoleActor() override;
+
+    virtual void handle_message(StringView type, JsonObject const&) override;
+
+private:
+    ConsoleActor(DevToolsServer&, String name, WeakPtr<TabActor>);
+
+    void received_console_result(String result_id, String input, JsonValue result, BlockToken);
+
+    WeakPtr<TabActor> m_tab;
+
+    u64 m_execution_id { 0 };
+};
+
+}