Energy Monitor plug BL6523GX based Tasmotized added support in tasmota BL6523

This is one of the variation of the very popular and cheap energy monitors available. So far some of the other variations are already hacked in similar lines. Now this one is also can be hacked very easily to IoTify the same. A very accurate enrgy monitor based on Belling BL6523GX chipset now tasmotized.

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Update(17-02-2022): This is already merged to Tasmota mainline. So you can clone the development branch or try nightly allsensors build.

You can also use this pre-built firmware to test:
https://github.com/xoseperez/espurna/...

Connection Eg (ESP8266) - Non - Isolated:
* BL6523 RX - 1KOhm - ESP IO4(D2) (Should be Input Capable)
* BL6523 TX - 1KOhm - ESP IO5(D1) (Should be Input Capable)
* BL6523 GND - ESP GND
*
* Connection Eg (ESP32) - Non - Isolated:
* BL6523 RX - 1KOhm - ESP IO4 (Should be Input Capable)
* BL6523 TX - 1KOhm - ESP IO5 (Should be Input Capable)
* BL6523 GND - ESP GND
*
* To build add the below to user_config_override.h
* #define USE_ENERGY_SENSOR
* #define USE_BL6523 // Add support for Chinese BL6523 based Watt hour meter (+1k code)¸
*
* After Installation use the below template sample:
* {"NAME":"BL6523 Smart Meter","GPIO":[0,0,0,0,8000,8032,0,0,0,0,0,0,0,0],"FLAG":0,"BASE":18}
*
* or configure manually as below
* GPIO4 - BL6523 Tx
* GPIO5 - BL6523 Rx