Enhancement: register_fixture return type should be properly type-hinted

[giulioindev]

The current return type of the register_fixture function is Any, shouldn't be better using a TypeVar in order get a proper type hint?

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[guacs]

Sounds good to me! PRs would be appreciated :)

[giulioindev]

Shouldn't it be better to use the pattern suggested by pytest docs instead of using the register_fixture decorator? Managing the type hints properly causes some tests to fail since the decorator never returns the factory type but only callables.