Updated the return type of functions and related code from `string` to `any` to improve flexibility and support more diverse outputs. Adjusted function implementations, signatures, and handling of results accordingly.
Introduced `WithFunctionRemoved` and `ExecuteCallbacks` methods to enhance `ToolBox` functionality. This allows dynamic function removal and execution of custom callbacks during tool call processing. Also cleaned up logging and improved handling for required tools in `openai.go`.
Modify `FunctionCall` struct to handle arguments as strings. Add debugging logs to facilitate error tracing and improve JSON unmarshalling in various functions.
