Implements the endpoint that retrieves the configuration of a running instance.
The configuration consists in a map of cli flag to the provided value along with the uid that of the user that started the process
## Summary
The new endpoint returns the current information to be used when calling the diagnostic procedure.
This also adds:
- add indexed connection info and method to extract active connections from connTracker
- add edge address to Event struct and conn tracker
- remove unnecessary event send
- add tunnel configuration handler
- adjust cmd and metrics to create diagnostic server
Closes TUN-8728
## Summary
This PR will add a new endpoint, "diag/system" to the metrics server that collects system information from different operating systems.
Closes TUN-8731
Luis Neto