functools.partial not supported

Using a `functools.partial()` object in `health()` results in an error:

```
  File "/usr/local/lib/python3.10/site-packages/fastapi_health/route.py", line 40, in health
    f"{condition.__name__}",
AttributeError: 'functools.partial' object has no attribute '__name__'
```

you can use `condition.func.__name__` instead.