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

docs/10.EXT-REFERENCE-HANDLER.md

@@ -316,15 +316,14 @@ jerryx_handler_gc (const jerry_call_info_t *call_info_p,
 **Summary**
 
 Provide a `print` implementation for scripts. The routine converts all of its
-arguments to strings and outputs them char-by-char using
-`jerry_port_print_byte`. The NULL character is output as "\u0000",
-other characters are output bytewise.
+arguments to strings and outputs them by using `jerry_port_print_buffer`.
+The NULL character is output as "\u0000", other characters are output bytewise.
 
 *Note*: This implementation does not use standard C `printf` to print its
 output. This allows more flexibility but also extends the core JerryScript
 engine port API. Applications that want to use `jerryx_handler_print` must
 ensure that their port implementation also provides
-`jerry_port_print_byte`.
+`jerry_port_print_buffer`.
 
 **Prototype**
 
@@ -345,7 +344,7 @@ jerryx_handler_print (const jerry_call_info_t *call_info_p,
 **See also**
 
 - [jerryx_register_global](#jerryx_register_global)
-- [jerry_port_print_byte](05.PORT-API.md#jerry_port_print_char)
+- [jerry_port_print_buffer](05.PORT-API.md#jerry_port_print_buffer)
 
 
 # Handler registration helper

docs/16.MIGRATION-GUIDE.md

@@ -770,3 +770,4 @@ In this section the new API functions are listed.
 - [`jerry_port_get_current_context`](05.PORT-API.md#jerry_port_get_current_context)
 - [`jerry_port_fatal`](05.PORT-API.md#jerry_port_fatal)
 - [`jerry_port_sleep`](05.PORT-API.md#jerry_port_sleep)
+- [`jerry_port_print_byte`](05.PORT-API.md#jerry_port_print_byte)