[Feature] Support CnosDB in iot-benchmark

[Subsegment]

The iot-benchmark repository currently supports most of the major time series databases, and I hope to submit a pr to make it support CnosDB as well. CnosDB is fully compatible with InfluxDB's protocol and can refer to influxDB for its implementation

CnosDB is an open source time series database, and this is the github address for CnosDB.

What do you think?