Provide and interface to `query` and `fragments`

We need an interface to uri `query` parameters and `fragments`.

Could be:

```python

class UPath(...):

    @property
    def query(self) -> Mapping[str, str]:
        ...

    @property
    def fragment(self) -> str:
        ...

    def with_query(self, **params: Any) -> UPath:
        ...

    def with_fragment(self, fragment: str) -> UPath:
        ...
```