* test: add test to ensure tool is called only once during crew execution
- Introduced a new test case to validate that the counting_tool is executed exactly once during crew execution.
- Created a CountingTool class to track execution counts and log call history.
- Enhanced the test suite with a YAML cassette for consistent tool behavior verification.
* ensure tool function called only once
* refactor: simplify error handling in CrewStructuredTool
- Removed unnecessary try-except block around the tool function call to streamline execution flow.
- Ensured that the tool function is called directly, improving readability and maintainability.
* linted
* need to ignore for now as we cant infer the complex generic type within pydantic create_model_func
* fix tests
* test: fix structured tool tests
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* feat: support to run async tool
Some Tool requires async execution. This commit allow us to collect tool result from coroutines
* docs: add docs about asynchronous tool support
