Everywhere: Move the Ladybird folder to UI

UI/Android/src/main/cpp/JNIHelpers.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2023, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "JNIHelpers.h"
+#include <AK/Utf16View.h>
+
+namespace Ladybird {
+jstring JavaEnvironment::jstring_from_ak_string(String const& str)
+{
+    auto as_utf16 = MUST(AK::utf8_to_utf16(str.code_points()));
+    return m_env->NewString(as_utf16.data(), as_utf16.size());
+}
+}