Create overload signatures for cached_file
Author: ringohoffman
Pull request: yes

# What does this PR do?

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Related #23980

this is part of a set of changes to improve the type checking in `PreTrainedModel.from_pretrained`. This PR specifically

1. creates `overload` signatures for `cached_file` s.t. when you pass in `_raise_exceptions_for_missing_entries` or `_raise_exceptions_for_connection_errors` either implicitly or explicitly (except via `dict` unpacking), we can get the actual correct return type

I asked on the `pyright` discussions to understand pyright's limitations regarding dict unpacking: https://github.com/microsoft/pyright/discussions/5231 ([addressed!](https://github.com/microsoft/pyright/commit/d345e20ebf5fb1d9e322aa3560187571a7f8cf16)) but I think this will only really benefit us if the `dict` isn't just `dict[str, Any]`, which they generally are in the places where we were attempting to perform `dict` unpacking. IMO manually passing it in in the few places where we were doing unpacking isn't really a big deal

before:
<img width="514" alt="Screenshot 2023-06-03 at 11 09 07 PM" src="https://github.com/huggingface/transformers/assets/27844407/255a4b07-7b15-41e9-97e9-041c5dc8146b">
<img width="567" alt="Screenshot 2023-06-03 at 11 09 45 PM" src="https://github.com/huggingface/transformers/assets/27844407/f3a23532-894d-4b6a-a061-bc320b88e648">

after:
<img width="489" alt="Screenshot 2023-06-03 at 11 11 47 PM" src="https://github.com/huggingface/transformers/assets/27844407/d6a1dd36-4d35-4d26-9d93-ab308b55b85b">
<img width="510" alt="Screenshot 2023-06-03 at 11 10 11 PM" src="https://github.com/huggingface/transformers/assets/27844407/e4f2c6e6-f128-47e2-ae94-85e0a5a1ba81">



## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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## Who can review?

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Documentation: @sgugger, @stevhliu and @MKhalusova

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Comments:
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