List asteroid models in HF's hub

[mpariente]

Just so that we can do that.

In [6]: from asteroid.utils.hub_utils import model_list

In [7]: model_list(name_only=True)
Out[7]: 
['julien-c/DPRNNTasNet-ks16_WHAM_sepclean',
 'mpariente/ConvTasNet_WHAM_sepclean']

We'll exchange it with the current show_available_models etc.. when we get rid of Zenodo.

[jonashaag]

Looks good!

[jonashaag]

Of course the cache will not survive an interpreter restart. We could implement a file based cache if we find it too slow.