Add support for Proxmox firewall management

[StencilwashCoder]

Feature Request

Problem:
Currently, firewall rules must be managed through the Proxmox UI or manually via SSH.

Proposed Solution:
Add firewall management tools:

1. Cluster Firewall:

   • proxmox_firewall_rules_list - List all rules
   • proxmox_firewall_rule_add - Add new rule
   • proxmox_firewall_rule_delete - Remove rule

2. VM/CT Specific:

   • proxmox_vm_firewall_enable - Enable firewall for VM
   • proxmox_vm_firewall_rules - Manage VM rules

3. Security Groups:

   • Create and manage security groups
   • Apply groups to multiple VMs

Priority: Medium