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

docs/examples/Subnet-VLAN-Creation.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 available interfaces
+$interfaces = Get-OPNSenseInterface
+$interfaces | Format-Table -Property Name, Description, Status
+
+# Create VLANs for subnets with sequential VLAN IDs
+$result1 = New-OPNSenseSubnetVLANs -ParentInterface "em0" -Network "192.168.0.0/24" -SubnetMaskBits 27 -StartingVlanId 10 -VlanIdIncrement 1
+Write-Output "Created VLANs with sequential IDs:"
+$result1.VLANs | Format-Table -Property VlanId, Subnet, Gateway, Status
+
+# Create VLANs for subnets with VLAN IDs in multiples of 10
+$result2 = New-OPNSenseSubnetVLANs -ParentInterface "em1" -Network "10.0.0.0/16" -SubnetMaskBits 24 -StartingVlanId 100 -VlanIdIncrement 10
+Write-Output "Created VLANs with IDs in multiples of 10:"
+$result2.VLANs | Format-Table -Property VlanId, Subnet, Gateway, Status
+
+# Create VLANs for subnets with DHCP enabled
+$result3 = New-OPNSenseSubnetVLANs -ParentInterface "em2" -Network "172.16.0.0/20" -SubnetMaskBits 24 -StartingVlanId 200 -VlanIdIncrement 1 -EnableDHCP -DescriptionPrefix "VLAN-DHCP"
+Write-Output "Created VLANs with DHCP enabled:"
+$result3.VLANs | Format-Table -Property VlanId, Subnet, Gateway, Status
+
+# Get all VLANs
+$vlans = Get-OPNSenseVLAN
+$vlans | Format-Table -Property Uuid, Tag, Interface, Description
+
+# Disconnect from the firewall
+Disconnect-OPNSense