Add ModernBERT Decoder Models - ModernBERT, but trained with CLM! (#38967)
* working locally; need to style and test
* added docs and initial tests; need to debug and flesh out
* fixed tests
* working long context; batches
* working fa2 and eager
* update tests
* add missing confnigs
* remove default autoset
* fix spacing
* fix most tests
* fixed tests
* fix to init
* refactor to match new transformers updates
* remove static cache option
* fa2 fix
* fix docs
* in progress
* working on tests
* fixed issue with attn outputs
* remove debug
* fix local config attr
* update doc string
* fix docstring
* add docs to toc
* correct typo in toc
* add new updates from main w.r.t. ModernBERT RoPE
* fix local param
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Co-authored-by: oweller2 <oweller2@dsailogin.mgmt.ai.cluster>
Co-authored-by: oweller2 <oweller2@l07.mgmt.ai.cluster>
Co-authored-by: oweller2 <oweller2@n02.mgmt.ai.cluster>
Co-authored-by: oweller2 <oweller2@l08.mgmt.ai.cluster>
Co-authored-by: oweller2 <oweller2@l01.mgmt.ai.cluster>
Co-authored-by: oweller2 <oweller2@l02.mgmt.ai.cluster>