Add druid-mcp-server

[schmichri]

Description

Server Details

• Server:
  Database / Apache Druid https://github.com/iunera/druid-mcp-server
• Changes to:
  README.md

Motivation and Context

Add Druid MCP Server - STDIO/SEE MCP Server for Apache Druid by iunera that provides extensive tools, resources, and prompts for managing and analyzing Druid clusters.

How Has This Been Tested?

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context