Add AI-powered triage agent workflow and documentation for automated issue management

[Copilot]

This PR integrates an AI-powered triage agent system to automatically analyze, label, and manage new issues in the vscode-lombok repository. The implementation is based on the proven workflow from the vscode-gradle repository, adapted for the specific scope of Lombok annotation support.

Changes Made

1. Triage Agent Workflow (.github/workflows/triage-agent.yml)

Adds a GitHub Actions workflow that:

• Automatically triggers when new issues are opened
• Supports manual dispatch for re-triaging existing issues
• Calls an Azure Function to analyze issue content using AI
• Automatically applies appropriate labels based on issue content
• Includes robust error handling and timeout management
• Key Update: Modified repoId from microsoft/vscode-gradle to microsoft/vscode-lombok to correctly target this repository

2. LLM Documentation (.github/llms.md)

Provides contextual information for the AI triage system:

• Describes the vscode-lombok extension's specific functionality (Lombok annotation support)
• Defines clear labeling rules for Lombok-related issues
• Establishes guidelines for distinguishing between bug reports, enhancements, documentation, and questions
• Customized Content: Replaced generic Extension Pack for Java content with vscode-lombok-specific information

Benefits

• Automated Issue Management: Reduces manual effort in categorizing and labeling new issues
• Consistent Labeling: Ensures issues are labeled according to established patterns
• Improved Response Time: Helps maintainers quickly identify issue types and priorities
• Better Issue Organization: Makes it easier to filter and search for specific types of issues

Technical Details

The workflow requires the following repository secrets to be configured:

• TRIAGE_FUNCTION_LINK: URL endpoint for the Azure Function
• Repository variables:
  • TRIAGE_AGENT_TIMEOUT: Timeout value for the triage requests

The system is designed to fail gracefully if the Azure Function is unavailable, ensuring it won't block issue creation or repository operations.

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