Add UI layout XML automation

src/ui_core/layout_xml.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "foundation/result.h"
+
+#include <cstddef>
+#include <string_view>
+
+namespace pp::ui {
+
+struct LayoutParseSummary {
+    std::size_t node_count = 0;
+    std::size_t length_attribute_count = 0;
+};
+
+[[nodiscard]] pp::foundation::Result<LayoutParseSummary> parse_layout_xml(std::string_view xml);
+
+}