Empty metadata for hf-xet install

### Describe the bug

I am using `pip-licenses-cli` in my CI pipelines in a python:3.11-bookworm container to check overall license compliance in my projects and `hf-xet` showed up with license `UNKNOWN`.
Pypi does not see any license or description information either (https://pypi.org/project/hf-xet/).

Not sure if it is related to maturin, the relative reference in https://github.com/huggingface/xet-core/blob/main/hf_xet/LICENSE or something else.
I haven't used the build system, but there seems to be a potential solution for this in #464 by specifying the license explicitly. 


### Reproduction

```bash
$ docker run -it --rm python:3.11-bookworm /bin/bash
$ pip install pip-licenses-cli hf-xet
$ pip-licenses
 Name    Version  License
 hf-xet  1.1.8    UNKNOWN
```

### Logs

```shell

```

### System info

```shell
$huggingface-cli env
env | grep HF_XET
bash: huggingface-cli: command not found

not needed, since install alone is enough to recreate
```

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