Various fixes

[percevalw]

Description

Added

• Allow kwargs in eds.transformer to pass to the transformer model

Fixed

• Allow missing meta.json, tokenizer and vocab paths when loading saved models
• Save torch buffers when dumping machine learning models to disk (previous versions only saved the model parameters)
• Fix automatic batch_size estimation in eds.transformer when max_tokens_per_device is set to auto and multiple GPUs are used

Checklist

• [x] If this PR is a bug fix, the bug is documented in the test suite.
• [x] Changes were documented in the changelog (pending section).
• [x] If necessary, changes were made to the documentation (eg new pipeline).

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.36842% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.07%. Comparing base (3705c48) to head (1590926).

Files	Patch %	Lines
edsnlp/processing/multiprocessing.py	96.87%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #271 +/- ## ======================================= Coverage 97.06% 97.07% ======================================= Files 256 256 Lines 8662 8677 +15 ======================================= + Hits 8408 8423 +15 Misses 254 254 ```

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