Improve dict generation for key-dependent branches

[Shikaikai02]

Hi, I’m exploring the input space of Python APIs for a research project. Many of the functions I target accept **kwargs or other dictionary parameters. Currently Pynguin builds dicts at random, so code like

def foo(d: dict[str, int]):
    if d['k'] == 10: ...

never enters the if. Do you have any plans to treat constant keys ('k') as guidance hints, as scalars already are? This would greatly help coverage for dict-heavy APIs. Thanks!