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

docs/examples/Cron-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 cron jobs
+$cronJobs = Get-OPNSenseCronJob
+$cronJobs | Format-Table -Property Uuid, Description, Command, Minutes, Hours, Days, Months, Weekdays, Enabled
+
+# Get a specific cron job
+$job = Get-OPNSenseCronJob -Uuid $cronJobs[0].Uuid
+$job
+
+# Create a new cron job that runs daily at 2:00 AM
+$dailyBackup = New-OPNSenseCronJob -Description "Daily backup" -Command "/usr/local/bin/backup.sh" -Minutes "0" -Hours "2" -Days "*" -Months "*" -Weekdays "*" -Apply
+$dailyBackup
+
+# Create a new cron job that runs weekly on Sunday at 3:00 AM
+$weeklyCleanup = New-OPNSenseCronJob -Description "Weekly cleanup" -Command "/usr/local/bin/cleanup.sh" -Minutes "0" -Hours "3" -Days "*" -Months "*" -Weekdays "0" -Apply
+$weeklyCleanup
+
+# Update a cron job
+Set-OPNSenseCronJob -Uuid $dailyBackup -Hours "3" -Description "Updated daily backup" -Apply
+
+# Disable a cron job
+Disable-OPNSenseCronJob -Uuid $dailyBackup -Apply
+
+# Enable a cron job
+Enable-OPNSenseCronJob -Uuid $dailyBackup -Apply
+
+# Remove a cron job
+Remove-OPNSenseCronJob -Uuid $weeklyCleanup -Force -Apply
+
+# Disconnect from the firewall
+Disconnect-OPNSense