Endpoint logger

[david-littlefarmer]

This PR adds endpoint logger, which would add endpoint name, service name and time when the request was received.

Then whenever we would do log from application, we would also get these attributes in log, for better debugging and tracking. It would also add these attributes to logs outside of the handler, for example to logs from database functions, etc.

slog.String("service", values.service)
slog.String("endpoint", values.endpoint)
slog.Duration("since", time.Since(values.time))

[VojtechVitek]

LGTM