Add JK balancer support

[syssi]

https://github.com/NEEY-electronic/JK/blob/JK-Balancer/Jikong-Balancer-RS485-Communication%20Protocol.pdf
https://github.com/jblance/mpp-solar/blob/master/mppsolar/protocols/jk485.py

TX -> 55 AA 01 FF 00 00 FF
RX <- EB 90 01 FF 1E D3 0F 69 14 13 02 00 00 00 07 00 00 00 05 03 E8 01 14 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 0F 69 00 16 6F

[syssi]

Help wanted: Do you own an JK balancer and are you sure your device supports the protocol mentioned above? For example: Your device is accesible using the jk485 protocol of jblance/mpp-solar and you want to move to a native ESP solution. Please provide some support/testing here!