Add `ufl.reference_grad`
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- Python
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Description
The functions in operators.py (eg [`ufl.grad`](https://github.com/FEniCS/ufl/blob/b9af69fefafbf782214ae217b31b16b9acc48b97/ufl/operators.py#L385-L403)) are nice user-friendly functions. There isn't a corresponding nice function for `ufl.differentiation.ReferenceGrad`.
I propose that we add a function `reference_grad` to operators.py (and import it into [__init__.py](https://github.com/FEniCS/ufl/blob/b9af69fefafbf782214ae217b31b16b9acc48b97/ufl/__init__.py#L346-L417))
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