Support for influxdb 2.0 metrics

[destag]

Influx recently released 2.0 version of their database. It brings some major changes (like dropped support for udp protocol).

With new version they released a new golang client. Can we add support for this new client?

I would be happy to implement it. But I wanted to find out if it is desired.

[peterbourgon]

I don't think code like this needs to live in the Go kit repo. Do you agree? If so, I would be happy to link to your implementation.

[destag]

There is metrics package for influx 1.x so I thought it would be nice if we had similar wrapper for influx 2.x

[sagikazarmark]

I agree with @peterbourgon: the core is large enough as it is. As part of #843 things like metrics should probably be moved out of the core repo.