Print out the (non-secret) configuration environment variables on startup

[simon-20]

As a developer,
I want to see the configuration that the BDS is using in the logs
so that I can tweak the configuration settings and optimise performance based on it's real-time behaviour.

Acceptance criteria

1. Functional Criteria Add a few lines which print to the logs after the "Initialising version WHATEVER..." the configuration variables the Bulk Data Service is using. Don't print the secrets, just the configuration variables like the timeouts, the loop wait periods, and so on.