[GPU] Enable BY_CHANNEL de-quantize/re-quantize support in KV_CACHE_R… #32783
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mklimenk
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src/plugins/intel_gpu/src/graph/impls/ocl_v2/pa_kv_cache_rotate_ref.cl
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…OTATE OCL kernel ### Details: 1. The existing kernel handles RoPE (Rotary Position Embedding) for the key cache. 2. For this we need to read the key cache contents (quantized) and apply corresponding rotation coefficients provided as inputs (cos, sin). 3. In order to do the rotation calculation, the kernel first need to de-quantize the key cache content on the fly. 4. The dequantize logic differs based on whether "by-token" or "by-channel" kv cache quantization was used in the prior kv_cache_update stage. 5. This PR adds support for "by-channel" dequantization before rotation and again "by-channel" re-quantize post rotation. ### Tickets: - *CVS-170994*
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[GPU] Enable BY_CHANNEL de-quantize/re-quantize support in KV_CACHE_ROTATE OCL kernel
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