support SDPA Attention in stablelm (#29106)
* support SDPA Attention in stablelm
* add integration test
* add fallback for output_attentions
* Update src/transformers/models/stablelm/modeling_stablelm.py
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
* Update tests/models/stablelm/test_modeling_stablelm.py
Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>
* Update src/transformers/models/stablelm/modeling_stablelm.py
Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>
* handle non-contiguous states
---------
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>
