refactor: clean up imports and enhance AirweaveSearchTool schema

- Removed unnecessary imports and organized the import statements for clarity.
- Updated the AirweaveSearchToolSchema to use more concise type hints and improved formatting for better readability.
- Ensured that the API key and base URL fields in the AirweaveSearchTool class are now using optional type hints consistently.
- Enhanced the error handling in the search methods to provide clearer error messages.

Author: EwanTauran

lib/crewai-tools/src/crewai_tools/tools/airweave_tool/__init__.py

@@ -1,4 +1,5 @@
 from .airweave_search_tool import AirweaveSearchTool
 
+
 __all__ = ["AirweaveSearchTool"]