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

docs/examples/Configuration-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 configuration backups
+$backups = Get-OPNSenseConfigBackup
+$backups | Format-Table -Property Filename, Description, FileSize, Date, Version
+
+# Create a new configuration backup
+$backupFilename = Backup-OPNSenseConfig -Filename "pre-upgrade-backup"
+Write-Output "Created backup: $backupFilename"
+
+# Export the configuration to a file
+$exportPath = "C:\Backups\opnsense-config.xml"
+Export-OPNSenseConfig -Path $exportPath -Force
+Write-Output "Exported configuration to: $exportPath"
+
+# Import a configuration from a file
+# Note: This will restart the firewall
+# Import-OPNSenseConfig -Path $exportPath -Confirm
+
+# Restore a configuration backup
+# Note: This will restart the firewall
+# Restore-OPNSenseConfig -Filename $backupFilename -Confirm
+
+# Disconnect from the firewall
+Disconnect-OPNSense