Rich rules: add list function

[gsanchietti]

Current implementation of rich rules for modules does not include an function to list currently configured rules.

A module, may need to know what it's exactly installed to implement update strategies based on current rules.

Proposed solution

Add a new list rich rules inside the fwadm role.

Additional context

Original issue #7776

[gsanchietti]

Test image: core-3.22.0-dev.6

To install the test image: update-core ghcr.io/nethserver/core:3.22.0-dev.6

Test case 1

• Update an existing machine
• Execute list-rules action: api-cli run node/1/list-rich-rules, it must return the list of reach rules if any

Test case 2

• Execute the following script inside an action of a module that has fwadm module:

   #!/usr/bin/env python3
   import agent
  
   for rule in agent.list_rich_rules():
      print(rule)

The script must print the list of rich rules like above