link: Support changing VLAN filter of bridge itself

[cathay4t]

Mimicking command bridge vlan add dev br0 vid 11 self by introducing
LinkBridgeVlan::bridge_self().

Example code updated and manually tested.

[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 adding support for configuring VLAN filters directly on a bridge interface, mirroring the bridge vlan add dev <bridge_name> vid <vlan_id> self command. This allows for more comprehensive VLAN management within the library.

Highlights

• New API for Bridge VLAN Self-Configuration: Introduced LinkBridgeVlan::bridge_self() to allow setting VLAN filters directly on the bridge interface, analogous to the bridge vlan add dev <bridge> vid <id> self command.
• Updated Example: The set_bridge_vlan.rs example has been modified to demonstrate the usage of the new bridge_self() method, including adding a PVID and VLAN ranges to the bridge itself.
• Enhanced Example Output: The example now prints VLAN information for both the dummy interface and the bridge interface, providing clearer feedback on the configured VLANs.

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[gemini-code-assist]

Code Review

This pull request introduces support for configuring VLAN filters on the bridge device itself, which is a useful addition. The implementation is straightforward, adding a bridge_self() method and updating the example to demonstrate its usage. The changes are correct and well-implemented. I have one minor suggestion for the example code to improve its readability and make it more idiomatic.