feat: add accessibility RAG querying tool

[tech-sushant]

This pull request introduces a new tool for handling accessibility-related questions using a RAG (Retrieval-Augmented Generation) approach. It integrates a new API endpoint for querying accessibility data, updates the server to include this tool, and ensures proper error handling and tracking. Below are the key changes grouped by theme:

Accessibility Tool Enhancements:

• New RAG Query Functionality: Added the queryAccessibilityRAG function in src/tools/accessibility-rag.ts to query an external API for accessibility-related questions. This function formats the response with relevant documentation links and handles errors gracefully.
• Integration with Accessibility Tools: Imported the queryAccessibilityRAG function into src/tools/accessibility.ts to enable its use within the accessibility tools module.
• New Accessibility Tool Registration: Added a new tool, accessibilityQuestions, to the MCP server in src/tools/accessibility.ts. This tool uses the queryAccessibilityRAG function to handle accessibility-related queries and includes error handling and telemetry tracking.

Code Organization:

• Reordering Tool Registrations: Moved addAccessibilityTools earlier in the registerTools function in src/index.ts to align with the logical grouping of tools.

[ruturaj-browserstack]

LGTM