feat: Add BIRD2 language

[Alice39s]

Summary

This PR introduces syntax highlighting support for the BIRD2 configuration language via .conf files used by the BIRD Internet Routing Daemon.

Unlike simpler configuration models (e.g., INI or Nginx), BIRD employs a uniquely intricate paradigm with distinct implementation challenges. We address this by adding a textmate grammar with precise scoping for:

• Protocol definitions
• Filter functions
• Route maps
• Other core BIRD2 constructs

Motivation

BIRD2 powers critical Internet infrastructure at scale, including:

• AMS-IX – 870+ ASNs, 14Tb/s traffic (ref)
• LINX – 1,000+ BGP sessions on v2.13 (ref)
• Cloudflare – Anycast routing across all edge PoPs (ref)

Despite its critical role in major Internet infrastructure, editors like VSCode and Shiki lack native grammar support for BIRD2 configurations. This PR aims to fill that gap.

References

• Grammar Source: bird-chinese-community/BIRD-tm-language-grammar
• Main Contributors: Alice39s, pppwaw
• License: MPL-2.0

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