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

CHANGELOG.md

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+# Changelog
+
+All notable changes to the PSOPNSenseAPI module will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.6.0] - 2025-04-14
+
+### Added
+- Port forwarding management (Get, New, Set, Remove)
+- Added unit tests for interface management
+
+### Changed
+- Updated IPNetwork2 library from version 2.6.618 to 3.1.764
+- Updated code to use the new namespace (System.Net) for IPNetwork2
+- Added support for .NET 8.0 and .NET 9.0
+- Improved XML documentation for all classes and methods
+- Made OPNSenseApiClient more testable by introducing an interface
+
+## [0.5.0] - 2025-04-16
+
+### Added
+- Tailscale VPN management (Get, Enable, Disable, Connect, Disconnect)
+- Auto-installation of Tailscale plugin if not present
+- Support for configuring Tailscale settings
+- Subnet route advertising for Tailscale networks
+
+## [0.4.0] - 2025-04-15
+
+### Added
+- DHCP server management (Get, Set)
+- DHCP static mapping management (Get, New, Set, Remove)
+- Cron job management (Get, New, Set, Remove, Enable, Disable)
+- Improved credential handling in Restart-OPNSenseFirewall
+- Switched from IPNetwork to IPNetwork2 for better subnet handling
+- Implemented DHCP configuration in New-OPNSenseSubnetVLANs
+
+## [0.3.0] - 2025-04-14
+
+### Added
+- Plugin management (Get, Enable, Disable, Install, Uninstall)
+- User management (Get, New, Set, Remove)
+- Firmware management (Get, Update, Upgrade)
+- Firewall reboot functionality with wait for reconnection
+- Subnet division and VLAN creation utility
+- Completed all firewall rule, alias, and NAT rule management cmdlets
+
+## [0.2.0] - 2025-04-14
+
+### Added
+- Interface management (Get, Set, Restart, Statistics)
+- VLAN management (Get, New, Set, Remove)
+- DNS configuration (Servers, Domains, Overrides)
+- Configuration backup and restore functionality
+
+## [0.1.0] - 2025-04-14
+
+### Added
+- Initial release
+- Basic connection management (Connect-OPNSense, Disconnect-OPNSense)
+- Firewall rule management (Get, New, Set, Remove, Enable, Disable)
+- Alias management (Get, New, Set, Remove)
+- NAT rule management (Get, New, Set, Remove)
+- Comprehensive logging system
+- Error handling and retry logic
+- Support for both PowerShell 5.1 and PowerShell 7