feat: notification proxy (#70)

* init

* chore: clippy and fmt

* feat: ffi wrapper

* feat: multi-observe and timeout to notification proxy

* fix: nitpicks

1. proxy death its onw error in emun #69
2. make returned stream actual stream, copied from 54439b85dd/idevice/src/services/bt_packet_logger.rs (L126-L138)

cpp/include/idevice++/notification_proxy.hpp

@@ -0,0 +1,46 @@
+#pragma once
+#include <idevice++/bindings.hpp>
+#include <idevice++/ffi.hpp>
+#include <idevice++/provider.hpp>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace IdeviceFFI {
+
+using NotificationProxyPtr = std::unique_ptr<NotificationProxyClientHandle,
+    FnDeleter<NotificationProxyClientHandle, notification_proxy_client_free>>;
+
+class NotificationProxy {
+  public:
+    // Factory: connect via Provider
+    static Result<NotificationProxy, FfiError> connect(Provider& provider);
+
+    // Factory: wrap an existing Idevice socket (consumes it on success)
+    static Result<NotificationProxy, FfiError> from_socket(Idevice&& socket);
+
+    // Ops
+    Result<void, FfiError>        post_notification(const std::string& name);
+    Result<void, FfiError>        observe_notification(const std::string& name);
+    Result<void, FfiError>        observe_notifications(const std::vector<std::string>& names);
+    Result<std::string, FfiError> receive_notification();
+    Result<std::string, FfiError> receive_notification_with_timeout(u_int64_t interval);
+
+    // RAII / moves
+    ~NotificationProxy() noexcept                                      = default;
+    NotificationProxy(NotificationProxy&&) noexcept                    = default;
+    NotificationProxy& operator=(NotificationProxy&&) noexcept         = default;
+    NotificationProxy(const NotificationProxy&)                        = delete;
+    NotificationProxy& operator=(const NotificationProxy&)             = delete;
+
+    NotificationProxyClientHandle* raw() const noexcept { return handle_.get(); }
+    static NotificationProxy adopt(NotificationProxyClientHandle* h) noexcept {
+        return NotificationProxy(h);
+    }
+
+  private:
+    explicit NotificationProxy(NotificationProxyClientHandle* h) noexcept : handle_(h) {}
+    NotificationProxyPtr handle_{};
+};
+
+} // namespace IdeviceFFI