Allure-pytest: support hiding/masking a step's parameter

[delatrie]

Discussed in https://github.com/orgs/allure-framework/discussions/1610

^{Originally posted by nikeasyanzi March 11, 2022} I find the feature has implemented as secret in java. But is there any plan to implement that in other testing tools?

Feature request: a way to disable step parameter auto-displaying in the report. https://github.com/allure-framework/allure2/issues/863

[Tbruno25]

I'd be happy to port this over to python if one of the maintainers wants to give it a green light 🟢