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

docs/examples/Basic-Usage.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 the current connection information
+Get-OPNSenseConnection
+
+# Get all firewall rules
+$rules = Get-OPNSenseFirewallRule
+$rules | Format-Table -Property Uuid, Description, Protocol, SourceNet, DestinationPort, Action
+
+# Create a new firewall rule to allow HTTP traffic
+$ruleId = New-OPNSenseFirewallRule -Description "Allow HTTP" -Protocol TCP -DestinationPort 80 -Action pass
+Write-Output "Created rule with ID: $ruleId"
+
+# Apply the changes
+Apply-OPNSenseFirewallChanges -CancelRollback -Timeout 30
+
+# Disconnect from the firewall
+Disconnect-OPNSense