Add debug option to check HTTP request timings

[AnttiMK]

Is your feature request related to a problem? Please describe. #91

Describe the solution you'd like Add a config option to print HTTP request timings in the console every time a request is done. Helps to debug which VPN-checking service is slow with its responses, thus slowing the PreLoginEvent.

[Laarryy]

Good idea, I'll take a look at doing this at my earliest possible convenience.