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* add `dpt-hybrid` support

* refactor

* final changes, all tests pass

* final cleanups

* final changes

* Apply suggestions from code review
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* fix docstring

* fix typo

* change `vit_hybrid` to `hybrid`

* replace dataclass

* add docstring

* move dataclasses

* fix test

* add `PretrainedConfig` support for `backbone_config`

* fix docstring

* Apply suggestions from code review
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* remove `embedding_type` and replace it by `is_hybrid`
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>