Clean up deprecation warnings
Author: Davidy22
Pull request: yes

The deprecation spring cleaning mentioned in #19371

Notes:
Changed some strings in tests to raw strings, which will change the literal content of the strings as they are fed into whatever machine handles them.
Test cases for past in the past/past_key_values switch changed/removed due to warning of impending removal
Most of the warnings defined and thrown by transformers functions were left alone

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Comments:
_The documentation is not available anymore as the PR was closed or merged._

@Davidy22 Thanks for opening this PR and all of the fixes! 💪 

Just taking a look now. It would really helpful as a reviewer, and for future reference if you could give a quick summary of the deprecation warnings you tackled.

As a quick note regarding `PIL.Image.XXX` -> `PIL.Image.Resampling.XXX`, these changes might be breaking (c.f. [open transformers issue](https://github.com/huggingface/transformers/issues/19569) and [related PR in diffusers](https://github.com/huggingface/diffusers/pull/788) as it requires `Pillow>=9.1.0` which is not currently enforced. @sgugger What is the typical strategy for handling dependancy version updates? 

Thanks for pointing this out Amy! In this case, Pillow 9.1.0 is too recent to be pinned as a minimum version (our general rule of thumb is to provide a support for 2 years and this is only from April). So we will need to move those objects to our `image_utils.py` where we can do some checks like:
```py
if version.parse(version.parse(PIL.__version__).base_version) >= version.parse("9.1.0"):
    # Define enum using `PIL.Image.Resampling`
else:
    # Define enum using `PIL.Image`
```

As for the actual enum, we could name it `PILImageResampling`?

Oh whoops I probably should have taken a couple more notes, I only wrote down a couple of things that stood out as things that'd functionally change something. Summary from re-skimming through the listed changes:

- np types swapped with equivalent python default types
- PIL Resampling options switched to the new recommended location in the PIL library
- Some strings with non-python escapes changed to r strings.
- dict_type -> dict parameter in dictionary.Dictionary
- Usages of past changed to past_key_values
- topk -> top_k

Added PILImageResampling, dealt with some funky import issues in one file that weren't happening in any of the other files, don't know why specifically the flava test file would have issues importing from image_utils, hoping it's not some thing that actually also happens in other files but doesn't get surfaced because it's not covered or something