Add port forwarding support, improve XML documentation, and add unit tests

docs/examples/Interface-Management.ps1

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+# Import the module
+Import-Module PSOPNSenseAPI
+
+# Connect to the OPNSense firewall
+Connect-OPNSense -Server "https://firewall.example.com" -ApiKey "your_api_key" -ApiSecret "your_api_secret" -SkipCertificateCheck
+
+# Get all interfaces
+$interfaces = Get-OPNSenseInterface
+$interfaces | Format-Table -Property Name, Description, IpAddress, SubnetMask, Status
+
+# Get interface statistics
+$stats = Get-OPNSenseInterfaceStatistics
+$stats | Format-Table -Property Name, InPackets, OutPackets, InBytes, OutBytes
+
+# Update an interface
+Set-OPNSenseInterface -Name "lan" -Description "Local Area Network" -IpAddress "192.168.1.1" -SubnetMask "24" -Apply
+
+# Create a new VLAN
+$vlanId = New-OPNSenseVLAN -Interface "em0" -Tag 10 -Description "Management VLAN"
+Write-Output "Created VLAN with ID: $vlanId"
+
+# Get all VLANs
+$vlans = Get-OPNSenseVLAN
+$vlans | Format-Table -Property Uuid, Tag, Interface, Description
+
+# Disconnect from the firewall
+Disconnect-OPNSense