Extend existing influxdb integration

I found ticket OBS-2336 bit it seems to be dead since 2017. Because we need for various reasons some of the data observium collects in different metrics I checked the existing influxdb integration.

The first thing I saw that it is not compatible with influxdb 2.x because it is just using - of course - the first API. And of course it is very basic.

I reworked it a bit so it is working with API2, too. Is it possible the patch appended into source code?

Next: Because it is using curl in a very basic way, would it possible to integrate the official influxdb-php API into observium? (https://github.com/influxdata/influxdb-client-php) May be as some kind of plugin?

Not sure how often it is used that data collected from observium are exported to influxdb, but for us this is a really really usefull ability.