[WebNN] Support more features for GQA #27234
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Add support for GroupQueryAttention with: - do_rotary=true (cos_cache/sin_cache inputs) - Packed QKV (optional key/value inputs) - Optional past_key/past_value for prefill mode - Remove fp16->fp32 casting workaround Add ApplyRotaryEmbedding helper function. Fix decode stage by using qkv_sequence_length instead of has_past_key to distinguish prefill vs decode, and use runtime seqlens_k instead of static past_sequence_length for rotary position calculation.
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Add support for GroupQueryAttention with:
Add ApplyRotaryEmbedding helper function.
Fix decode stage by using qkv_sequence_length to distinguish prefill vs decode, and use runtime seqlens_k instead of static past_sequence_length for rotary position calculation.