Introduce JERRY_ZSTR_ARG macro to avoid jerryx_print_string, jerryx_print_byte, jerry_port_print_byte, strlen (#4982)

Replace usage of jerryx_print_byte, jerryx_print_string with jerryx_print_buffer.

As we now have JERRY_ZSTR_ARG, so we can take advantage of it

With this, the jerry_port_print_byte port api won't need any more
this reduced the port api surface

JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com

jerry-main/main-desktop.c

@@ -222,8 +222,14 @@ restart:
   }
   else if (arguments.source_count == 0)
   {
-    const char *prompt_p = (arguments.option_flags & OPT_FLAG_NO_PROMPT) ? "" : "jerry> ";
-    jerryx_repl (prompt_p);
+    if ((arguments.option_flags & OPT_FLAG_NO_PROMPT))
+    {
+      jerryx_repl (JERRY_ZSTR_ARG (""));
+    }
+    else
+    {
+      jerryx_repl (JERRY_ZSTR_ARG ("jerry> "));
+    }
   }
 
   result = jerry_run_jobs ();