Update ClickHouse driver to support HTTP

[AndreKR]

Use Case

ClickHouse offers both a "native" and an HTTP API.

The SQL output plugin has a setting driver="clickhouse" that is supposed to be able to push metrics to a ClickHouse database. The database credentials are given using the data_source_name setting.

Expected behavior

If I specify http://... as the DSN I'd expect it to connect to ClickHouse via HTTP and start pushing metrics.

Actual behavior

The SQL output plugin uses an old version of the ClickHouse driver which doesn't support HTTP yet.

It also doesn't actually detect that, so it will happily accept a http://hostname:1234 DSN and connect and try talking native protocol to the HTTP server, causing the whole Telegraf process to hang.

Additional info

No response