[GPU] GQA optimization, refactored

Author: sshlyapn

src/plugins/intel_gpu/src/graph/impls/ocl/paged_attention.cpp

@@ -1009,6 +1009,10 @@ struct paged_attention_impl : multi_stage_primitive<paged_attention> {
             impl->use_micro_sdpa = true;
         }
 
+        std::cout << "use_micro=" << impl->use_micro_sdpa << " KV-cache layouts=["
+                  << impl_param.get_input_layout(3).to_short_string() << ", "
+                  << impl_param.get_input_layout(4).to_short_string() << "]\n";
+
         return impl;
     }