initial support for lc709203f on ESP32_Bat_Pro

This is an attempt to add wrappers to the code provided by EzSBC in https://github.com/EzSBC/ESP32_Bat_Pro by adding required functions and renaming some subroutines. These were modelled on the esphome ads1115 and ina219 components

captured with mosquitto_sub  -F "%I %t %p" -v -t ezmin/debug
...
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:119]: LC709203F:
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:120]:   Address: 0x0B
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:126]:   Update Interval: 30.0s
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:128]:   Cell Voltage 'ezmin battery V'
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:128]:     Unit of Measurement: 'V'
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:128]:     Accuracy Decimals: 2
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:129]:   Cell Rem Pct 'ezmin battery lvl'
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:129]:     Unit of Measurement: '%'
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:129]:     Accuracy Decimals: 1
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:130]:   Cell StateCharge 'ezmin cell charge'
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:130]:     Unit of Measurement: '%'
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:130]:     Accuracy Decimals: 0
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:131]:   IC version 'ezmin ic'
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:131]:     Unit of Measurement: ''
2021-04-04T11:38:24-0400 ezmin/debug [C][lc709203f.sensor:131]:     Accuracy Decimals: 0
...
2021-04-04T11:38:42-0400 ezmin/debug [D][lc709203f.sensor:092]: Got Battery values: cellVoltage_mV=4149 cellRemainingPercent10=964 cellStateOfCharge=96 ic=0x2717
2021-04-04T11:38:42-0400 ezmin/debug [D][sensor:092]: 'ezmin battery V': Sending state 4.14900 V with 2 decimals of accuracy
2021-04-04T11:38:42-0400 ezmin/debug [D][sensor:092]: 'ezmin battery lvl': Sending state 96.40000 % with 1 decimals of accuracy
2021-04-04T11:38:42-0400 ezmin/debug [D][sensor:092]: 'ezmin ic': Sending state 10007.00000  with 0 decimals of accuracy
2021-04-04T11:38:42-0400 ezmin/debug [D][sensor:092]: 'ezmin cell charge': Sending state 96.00000 % with 0 decimals of accuracy
2021-04-04T11:39:23-0400 ezmin/debug [I][deep_sleep:067]: Beginning Deep Sleep
...

works to retreive these 4 values. I have hard coded my battery config in setup routine

Required code changes:

• revised [ESPHOME]/custom_components/lc709203f/lc709203f.h
• revised [ESPHOME]/custom_components/lc709203f/lc709203f.cpp
• revised [ESPHOME]/custom_components/lc709203f/sensor.py

add stanza to yaml for RGB led

switch:
  - platform: gpio
    pin:
      number: GPIO16
      inverted: true
    name: "${devicename} ledr"
    id:  ${devicename}_ledr
  - platform: gpio
    pin:
      number: GPIO17
      inverted: true
    name: "${devicename} ledb"
    id:  ${devicename}_ledb
  - platform: gpio
    pin:
      number: GPIO18
      inverted: true
    name: "${devicename} ledg"
    id:  ${devicename}_ledg

add stanza to yaml for fuel gauge

 - platform: lc709203f
    address: "0x0B"
    i2c_id: bus_a
    battery_voltage:
      name: "${devicename} battery V"
    battery_level:
      name: "${devicename} battery lvl"
    icversion:
      name: "${devicename} ic"
    cell_charge:
      name: "${devicename} cell charge"
    update_interval: 30s

TODO

• accept config for setPowerMode, setCellCapacity, setCellProfile ( to replace hard coded setup )
• accept value for lc709203f_current_direction_t mentioned at : https://github.com/RIOT-OS/RIOT/blob/df3ab9f16135dca610d81c0286eb23791170b21d/drivers/include/lc709203f.h
• TODO low priority because no resource/application for me---------------------
• capture values for getThermistorBeta, getCellTemperature
• accept config for setThermistorB, setTemperatureMode, setAlarmRSOC, setAlarmVoltage