[Zamba] Support attn_implementation dispatch (#46317)
* [ZambaForCausalLM] Support attn_implementation=sdpa dispatch
* Doc
* _supports_flash_attn
* Flash Doc
* Revert
* style fix, bto broken :(
* Apply repo consistency fixes
* Revert "Apply repo consistency fixes"
This reverts commit cc0e4e95840570a0e01ac6d442baed03586434d9.
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Co-authored-by: raushan <raushan@huggingface.co>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
