helpers: Add an async dialog box impl (#9919)

Adds an async dialog box, way safer than our previous local solution for ANR

src/helpers/AsyncDialogBox.hpp

@@ -0,0 +1,45 @@
+#pragma once
+
+#include "../macros.hpp"
+#include "./memory/Memory.hpp"
+
+#include <vector>
+#include <functional>
+
+#include <hyprutils/os/Process.hpp>
+#include <hyprutils/os/FileDescriptor.hpp>
+
+struct wl_event_source;
+
+class CAsyncDialogBox {
+  public:
+    static SP<CAsyncDialogBox> create(const std::string& title, const std::string& description, std::vector<std::string> buttons);
+
+    CAsyncDialogBox(const CAsyncDialogBox&)            = delete;
+    CAsyncDialogBox(CAsyncDialogBox&&)                 = delete;
+    CAsyncDialogBox& operator=(const CAsyncDialogBox&) = delete;
+    CAsyncDialogBox& operator=(CAsyncDialogBox&&)      = delete;
+
+    void             open(std::function<void(std::string)> onResolution);
+    void             kill();
+    bool             isRunning() const;
+
+    void             onWrite(int fd, uint32_t mask);
+
+  private:
+    CAsyncDialogBox(const std::string& title, const std::string& description, std::vector<std::string> buttons);
+
+    pid_t                            m_dialogPid       = 0;
+    wl_event_source*                 m_readEventSource = nullptr;
+    std::function<void(std::string)> m_onResolution;
+    Hyprutils::OS::CFileDescriptor   m_pipeReadFd;
+    std::string                      m_stdout = "";
+
+    const std::string                m_title;
+    const std::string                m_description;
+    const std::vector<std::string>   m_buttons;
+
+    // WARNING: cyclic reference. This will be removed once the event source is removed to avoid dangling pointers
+    SP<CAsyncDialogBox> m_selfReference;
+    WP<CAsyncDialogBox> m_selfWeakReference;
+};