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

docs/examples/DNS-Configuration.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 DNS server configuration
+$dnsConfig = Get-OPNSenseDNSServer
+Write-Output "DNS Server Configuration:"
+$dnsConfig
+
+# Update DNS server configuration
+Set-OPNSenseDNSServer -Forwarding -Forwarders "8.8.8.8","8.8.4.4" -RegisterDhcp -RegisterDhcpDomain "local" -Apply
+
+# Get all DNS overrides
+$overrides = Get-OPNSenseDNSOverride
+$overrides | Format-Table -Property Uuid, Hostname, Domain, IpAddress, Description
+
+# Create a new DNS override
+$overrideId = New-OPNSenseDNSOverride -Hostname "server" -Domain "local" -IpAddress "192.168.1.10" -Description "Internal server" -Apply
+Write-Output "Created DNS override with ID: $overrideId"
+
+# Remove a DNS override
+Remove-OPNSenseDNSOverride -Uuid $overrideId -Apply -Confirm:$false
+
+# Disconnect from the firewall
+Disconnect-OPNSense