reliability(consumers): add end to end test (WIP)

[volokluev]

Up until now we had no way to sanity check that our consumer implementation put all the rows in the database it needed to. Add a test which spins up the consumer along with kafka and clickhouse

[untitaker]

you can probably write this test more reliably when done entirely from within rust. we already have some tests there. then no subprocess is necessary, you'd launch the main function directly