Start assets component image signature tests

src/assets/image_format.h

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+#pragma once
+
+#include "foundation/result.h"
+
+#include <cstddef>
+#include <span>
+
+namespace pp::assets {
+
+enum class ImageFormat {
+    png,
+    jpeg,
+};
+
+[[nodiscard]] pp::foundation::Result<ImageFormat> detect_image_format(
+    std::span<const std::byte> bytes) noexcept;
+
+[[nodiscard]] const char* image_format_name(ImageFormat format) noexcept;
+
+}