Support writing readings to InfluxDB2

[Blizliam]

InfluxDB2 is a time-series database for great for storing lots of IoT data.

Since it is something I use in my home-lab, I added the capability to specify connection details in the config so that LPM hubs will write their readings directly to the database.

The configuration would look like this.

{
  "influxdb2_enabled": true,
  "influxdb2_url": "http://192.168.1.27:8086",
  "influxdb2_apitoken": "pOlPIog841Sw8sjh548bIyBDAXg8HGa2Rn80WlxHtuvsaPQjQXx_Kykt6-l69Rr9kKt1GanXVe9P3h6jtD27Gt==",
  "influxdb2_org": "MyBigCompany",
  "influxdb2_bucket": "LanternPowerMonitor"
}