examples: freemodbus add tcp support for common master/slave iface

Add TCP port files to provide Modbus TCP interface for communication
Add freemodbus add tcp support for common master/slave iface and tcp example based on socket API
The communication between master and slave checked for each example serial_master, serial_slave (use ModbusPoll TCP)
update tcp example according netif changes, fix ci issues
update TCP slave implementation
update example_test.py to to set IP through stdin
update API documentation
event bit instead of semahore to lock communication resource
update default options and master/slave port files

Closes https://github.com/espressif/esp-idf/issues/858
Closes IDF-452

examples/protocols/modbus/mb_example_common/modbus_params.c

@@ -0,0 +1,17 @@
+/*=====================================================================================
+ * Description:
+ *   C file to define parameter storage instances
+ *====================================================================================*/
+#include <stdint.h>
+#include "modbus_params.h"
+
+// Here are the user defined instances for device parameters packed by 1 byte
+// These are keep the values that can be accessed from Modbus master
+holding_reg_params_t holding_reg_params = { 0 };
+
+input_reg_params_t input_reg_params = { 0 };
+
+coil_reg_params_t coil_reg_params = { 0 };
+
+discrete_reg_params_t discrete_reg_params = { 0 };
+