Provide a custom repr for function params in `@step` decorator

[Eugene-1984]

I have a function like:

@step
def foo(x: np.ndarray, y: Dict[str, np.ndarray]): ...

It is marked with @step decorator and my problem is that the output in the allure repo is too large. I see that the special case of represnet is here https://github.com/allure-framework/allure-python/blob/3c74fd540021f776be7b52f8078c9d34eee5c3b6/allure-python-commons/src/utils.py#L167

So I was wondering how to handle other objects like np.ndarray or Dict[str, np.ndarray]?

One way is to subclass dict and give a nice repr to it, but what with a single numpy array?Sublassing it just so it got a better repr for allure looks... excessive?

Can @step accept an additional argument that will explicitly tell it hot to handle obj -> str representation?

I'm submitting a ...

• [x ] feature request

What is the current behavior?

A long text output in the allure report for types like np.ndarray or Dict[str, np.ndarray] that have long repr.

What is the expected behavior?

Make @step that receives explicit formatter so I can write:

def _my_repr(x: np.ndarray, y: Dict[str, np.ndarray]):
   return format_1(x), format_2(t)  # <-- custom formatting code here

@step(formatter=_my_repr)
def foo(x: np.ndarray, y: Dict[str, np.ndarray]): ...

Please tell us about your environment:

allure-pytest==2.9.45 allure-python-commons==2.9.45 pytest==6.2.5

Other information

I am willing on implementing that feature conditional on the fact there is a way of accepting that change to the mainstream. Will you accept a PR that parametrize @step in such a way?