Implementation of MCPToolboxTool (#111)

[TommasoTerrin]

This Pull Request implements the MCPToolBoxTool, providing native integration with Google MCP Toolbox servers.

Key Changes:

• Core implementation: Created MCPToolBoxTool to dynamically load and wrap remote tools into datapizza-ai native [Tool] objects.
• Support for advanced features: Added support for authentication via token getters and parameter injection through [bound_params]
• Unit Testing: Added a comprehensive suite of tests using pytest at [datapizza-ai-tools/mcptoolbox/tests/test_mcptoolbox.py]
• • Documentation: Added detailed documentation under /docs:
  • API Reference: docs/API Reference/Tools/mcptoolbox.md
  • User Guide: docs/Guides/Agents/mcptoolbox.md
• Manual Verification: Successfully tested against a real MCP Toolbox server instance (manual test script included in tests/test.py).

Pipeline & Quality:

• Ran the pre-commit pipeline to ensure compliance with formatting and linting standards (Ruff).
• All tests passed.
  Closes Proposal / Request for feedback: datapizza-ai-tools-mcptoolbox module (pre-PR discussion) #111

[TommasoTerrin]

Hi @Federaffo, as requested in #111 I've implemented the new feature and the documentation. Let me know if it needs any adjustaments.