feat: add lazy split in string op namespace.

src/yycc/patch/stream.hpp

@@ -10,7 +10,8 @@
  */
 namespace yycc::patch::stream {
 
-    // TODO: replace all old way of outputing utf8 string with this new way.
+    // TODO: fix all REINTERPRET::as_ordinary_view polyfill for std::ostream.
+    // TODO: replace all old way (C-style output) with this new way if possible.
 
     std::ostream& operator<<(std::ostream& os, const std::u8string_view& u8str);
     std::ostream& operator<<(std::ostream& os, const char8_t* u8str);