[Request]: Add `container network prune` command to remove unused networks

[realrajaryan]

Feature or enhancement request details

Add a container network prune subcommand to remove networks not connected to any containers.

Basic requirements:

• Remove all networks with no container connections
• Preserve default/system networks (e.g., bridge, host)
• Display list of removed network names

Example output:

Pruned networks:
some-network-1
some-network-2

Code of Conduct

• I agree to follow this project's Code of Conduct

[saehejkang]

currently working on this issue