Add benchmark test

[volcan01010]

tbc @rachelheaven

[rachelheaven]

Summary
As a developer I want to run some performance benchmark tests so I can see what impact my changes have on speed of processing

Description

Several of the improvements to this codebase are intended to improve the speed of processing, or may unintentionally degrade the performance. Benchmark performance tests would help to monitor this. Add extraction / insert / transform of 10k, 100k and 1M rows to integration tests (which run against local database) and report timings.

Acceptance criteria

• Integration tests include performance tests and timings are reported to standard output