Improve Corelink Server Logging

The PR proposes the following changes (closes #19 (closed)):

• Introduce a logging library, pino, in the corelink-server (see LOGGING.md)
• Allows configuring logging transports - currently, it simply logs to both stdout/stderr and dockerlog files. This is done on a separate worker thread and is automatically handled by pino under the hood. (see LOGGING.md and docs).
• Replaces existing console.log and console.error statements with proper logging methods.