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

docs/05.PORT-API.md

@@ -116,18 +116,6 @@ void jerry_port_context_free (void);
 void jerry_port_log (const char *message_p);
 ```
 
-```c
-/**
- * Print a single character to standard output.
- *
- * This port function is never called from jerry-core directly, it is only used by jerry-ext components to print
- * information.
- *
- * @param byte: the byte to print.
- */
-void jerry_port_print_byte (jerry_char_t byte);
-```
-
 ```c
 /**
  * Print a buffer to standard output