Add VictoriaMetrics to the list of tested databases

It would be great if [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics) would be added to the list of supported databases for the benchmark. VictoriaMetrics [understands Influx line protocol](https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/README.md#how-to-send-data-from-influxdb-compatible-agents-such-as-telegraf), so it can share data generation and data ingestion paths with InfluxDB. As for query path, VictoriaMetrics understands PromQL, so PromQL queries must be written for the supported queries. They can be based on the following pull request - https://github.com/timescale/tsbs/pull/96 .