…573)

Signed-off-by: Diwank Singh Tomer <[email protected]>

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> [!IMPORTANT]
> Refactor validation logic using monkeypatching and add new models and
custom types in `openapi_model.py`.
> 
>   - **Validation Refactor**:
> - Switch from subclassing to monkeypatching for validation functions
in `EvaluateStep`, `ToolCallStep`, `PromptStep`, `SetStep`, `LogStep`,
`ReturnStep`, `YieldStep`, `IfElseWorkflowStep`, and `MapReduceStep`.
>     - Add validators for Python expressions and Jinja templates.
>   - **Model Changes**:
>     - Add `CreateTransitionRequest` and `CreateEntryRequest` classes.
> - Define custom types `ChatMLContent`, `ChatMLRole`, `ChatMLSource`,
`ExecutionStatus`, and `TransitionType`.
>   - **Misc**:
> - Allow extra fields in `CreateTaskRequest`, `PatchTaskRequest`, and
`UpdateTaskRequest` using `ConfigDict`.
> 
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Signed-off-by: Diwank Singh Tomer <[email protected]>