add: differential privacy research model (#40851)
* VaultGemma
* Removing Sequence and Token classification models. Removing integration tests for now
* Remove pass-only modular code. style fixes
* Update vaultgemma.md
* Update docs/source/en/model_doc/vaultgemma.md
Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>
* Update docs/source/en/model_doc/vaultgemma.md
Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>
* Add links to model doc
* Correct model doc usage examples
* Updating model doc to describe differences from Gemma 2
* Update model_doc links
* Adding integration tests
* style fixes
* repo consistency
* attribute exception
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Co-authored-by: Amer <amersinha@gmail.com>
Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>
