NethSecurity Controller: add monitoring feature

[gsanchietti]

Update the NethSecurity Controller application to add the monitoring feature.

Required changes:

• update to latest controller release
• add Timescale database to store report data:
  • the database dump must be added to the backup
  • the database is accessed in write mode only from the API server
  • the database is access in read only mode from Grafana
• add MaxMind license for the API server: the license should be configurable using the UI
• apply retention also to Timescale database
• update Grafana to 11.2.0 (required to make work the render plugin on a subpath)
• update existing module installations to include a new port for Timescale, requires: New ports allocation system ns8-core#699
• expand documentation page

See related issues:

• Historical monitoring nethsecurity#754

[gsanchietti]

Test case 1

• Install a new instance of the controller: add-module ghcr.io/nethserver/nethsecurity-controller:latest
• Access the module UI and configure it , including the new Max Mind license field
• Save the configuration
• Verify the controller is accessible and units can be registered
• Follow the unit test case

Test case 2 (ON HOLD)

• Update an existing instance where there is at least one unit connected: api-cli run update-module --data '{"module_url":"ghcr.io/nethserver/nethsecurity-controller:latest","instances":["nethsecurity-controller1"],"force":true}'
• Verify the units still reconnect after the upgrade
• Check the timescale database is running: runagent -m nethsecurity-controller8 podman ps