Added WriterQuestionToKG and tests block for querying knowledge graphs

[jayyuwriter]

Add WriterQuestionToKG Block

This PR adds a new Workflow block that enables querying multiple knowledge graphs. Does not include an SVG logo at this time.

Features

• Query one or multiple knowledge graphs using comma-separated UUIDs
• Support for subqueries option
• Full error handling for missing or invalid inputs
• Direct integration with Writer AI SDK for graph queries

Implementation Details

• Uses WriterAIManager.acquire_client() for direct SDK access
• Handles multiple graph IDs via comma-separated string parsing
• Returns full Question response object with answer and subqueries
• Configurable subqueries option (yes/no)

Testing

Added comprehensive test suite covering:

• Single graph query
• Multiple graph queries
• Subqueries enabled/disabled
• Error handling for:
  • Missing graph IDs
  • Empty graph IDs
  • Missing questions
  • Empty questions
  • Missing required fields

[ramedina86]

Let's reconvene when @mmikita95 makes the necessary changes so that you can avoid using the SDK directly