Implement concept set management functionality for the MCP server, including:

• Getting existing concept sets
• Creating new concept sets
• Searching concepts

This feature will enable efficient management and retrieval of concept sets and individual concepts within the MCP server, supporting downstream analysis and data workflows.

Hecate: Has already an mcp server: https://github.com/OHDSI/Hecate/blob/main/mcp/README.md check if parts can be reused.