Update interfaces.py

[id-yananzhao]

What does this PR do?

let user overwrite the hardcoding savedir in pretrained.fetching.fetch function. The fetch function always creates pretrained_model_checkpoints in the root directory of the code and it can be a problem for some read-only system settings, e.g. AWS Lambda. No major changes except having the **kwarg passing around.

Fixes #<issue_number>

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[Adel-Moumen]

Could you please have a look @Gastron ? Thanks !

[TParcollet]

@Adel-Moumen this looks like an ontology that we do not want to apply only on this class/function but rather across the interface. We should keep it on a "todo" list for inferences changes.