Support flash-attention custom call #8
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Add custom call for the following four types of flash-attention:
__gpu$flash_attn_fwd__gpu$flash_attn_varlen_fwd__gpu$flash_attn_bwd__gpu$flash_attn_varlen_bwdThey correspond to Dao-AILab/flash-attention's
_flash_attn_forward_flash_attn_varlen_forward_flash_attn_backward_flash_attn_varlen_backwardPlease ensure to invoke these flash-attention custom-calls via torch_xla, as they enforce strict requirements on the shapes of inputs and outputs.