feat(snowflake): benchmarks

[farazdagi]

Summary

Add Snowflake as a benchmark destination

Closes ETL-649

Test

Ran cargo xtask benchmark --destination snowflake --warehouses 1 --streaming-duration-seconds 10 against real Snowflake:

Benchmark summary
+-----------------+-------------------+------------+---------+
| Benchmark       | Throughput        | Data rate  | Total   |
+-----------------+-------------------+------------+---------+
| Table copy      | 17,120.00 rows/s  | 8.77 MiB/s | 43.38 s |
| Table streaming | 6,214.65 events/s | 4.73 MiB/s | 35.64 s |
+-----------------+-------------------+------------+---------+

[coveralls]

coverage: 72.596% (-0.1%) from 72.716% — feat/snowflake-benchmarks into main