LibFileSystem: Move TempFile from LibCore to LibFileSystem

As suggested in commit de18485

Userland/Libraries/LibFileSystem/TempFile.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020-2023, the SerenityOS developers.
+ * Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+#include <AK/String.h>
+
+namespace FileSystem {
+
+class TempFile {
+
+public:
+    static ErrorOr<NonnullOwnPtr<TempFile>> create_temp_directory();
+    static ErrorOr<NonnullOwnPtr<TempFile>> create_temp_file();
+
+    ~TempFile();
+
+    String const& path() const { return m_path; }
+
+private:
+    enum class Type {
+        Directory,
+        File
+    };
+
+    TempFile(Type type, String path)
+        : m_type(type)
+        , m_path(move(path))
+    {
+    }
+
+    Type m_type;
+    String m_path;
+};
+
+}