Fix timeout in RedisSinkSingle

[rukai]

closes #491 (We now ensure we read a response for every request we send out, which fixes the hang)

Recreates these fixes that were incidentally fixed by https://github.com/shotover/shotover-proxy/pull/645/files :

• Fix timing issue where only a subset of the responses are returned. (fixed by looping until result.len() < requests_len)
• Fix errors going unreported and leaving the connection in an invalid state, we now terminate the connection and log an error when an error is encountered return Err(anyhow!("encountered error in redis stream: {err:?}"))

I've pulled these fixes out because they are important and the pubsub PR is very complicated and will take a while to review and land.

[github-actions]

0 benchmark regressed. 1 benchmark improved. Please check the benchmark workflow logs for full details: https://github.com/shotover/shotover-proxy/actions/runs/2780017905

  4 (4.00%) high severe
redis/passthrough_set   time:   [176.18 us 176.93 us 177.78 us]
                        thrpt:  [5.6249 Kelem/s 5.6519 Kelem/s 5.6759 Kelem/s]
                 change:
                        time:   [-24.413% -22.478% -20.493%] (p = 0.00 < 0.05)
                        thrpt:  [+25.775% +28.996% +32.299%]
                        Performance has improved.

[rukai]

Superceded by #645