Add stub_for support like in Java

### Proposal

I would very much like a syntax like in Java but in Python:
```python
stub_for(
    get("/file.csv").will_return(
        ok(
            body=CSV_CONTENT,
            headers={"Content-Type": "text/csv"},
            fixed_delay_milliseconds=2000,
        )
    )
)
```

### References

_No response_