link: Add LinkBridgePort for modifying bridge port properties

[cathay4t]

Example code set_bridge_port.rs included.

[gemini-code-assist]

Summary of Changes

Hello @cathay4t, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the rtnetlink library by introducing a new LinkBridgePort API, enabling programmatic configuration of various properties for Linux bridge ports. This functionality allows users to set attributes like port priority, state, and hairpin mode, providing more granular control over network bridge behavior. An accompanying example illustrates how to create a bridge, attach an interface, and apply these new bridge port settings.

Highlights

• New LinkBridgePort API: Added a new LinkBridgePort struct and associated builder methods to allow programmatic modification of Linux bridge port properties such as priority, state, and hairpin mode.
• Example Usage: Introduced a new example, set_bridge_port.rs, demonstrating how to create a network bridge, attach a dummy interface, and then configure its bridge port properties using the new LinkBridgePort API.
• Library Integration: Integrated the new LinkBridgePort functionality into the rtnetlink library's public API, making it accessible for network configuration tasks.

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[gemini-code-assist]

Code Review

This pull request introduces LinkBridgePort for modifying bridge port properties, along with a new example demonstrating its usage. The implementation is well-structured and follows the existing builder pattern in the crate. My review includes a few suggestions for improvement: in the example file, there's an unused import and a couple of copy-pasted error messages that should be corrected, and in the LinkBridgePort implementation, there is a redundant method that should be removed to improve API clarity. All comments align with the provided rules. Overall, the changes are good and this is a valuable addition to the library.