Feat/mcp/natural language search

[tourtourigny]

Create a new REST-like API to answer natural language question from the data in the knowledge graph.

Modified:

• triple search can now use limit of answers
• entity search traversal filters can be for both directions and are bidirectional by default
• MCP tools descriptions are shortened
• find many relations optimized

Removed:

• unused example prompt

Added:

• REST-like server for natural language queries using Gemini API
• route /question for faster natural language queries of data in the knowledge graph
• route /question_ai for more precise natural language queries of the data in the knowledge graph