llama : refactor llama_context, llama_kv_cache, llm_build_context (#12181)

* llama : refactor llama_context, llama_kv_cache, llm_build_context

ggml-ci

* graph : don't mutate the KV cache during defrag

ggml-ci

* context : reduce virtuals + remove test function

ggml-ci

* context : move interface implementation to source file + factory

ggml-ci

* graph : move KV cache build functions to llama_context impl

ggml-ci

* graph : remove model reference from build_pooling

ggml-ci

* graph : remove llama_model reference

ggml-ci

* kv_cache : provide rope factors

ggml-ci

* graph : rework inputs to use only unique_ptr, remove attn input abstraction

ggml-ci

* context : remove llama_context_i abstraction

ggml-ci

* context : clean-up

ggml-ci

* graph : clean-up

ggml-ci

* llama : remove redundant keywords (struct, enum)

ggml-ci

* model : adapt gemma3

ggml-ci

* graph : restore same attention ops as on master

ggml-ci

* llama : remove TODO + fix indent

ggml-ci

src/CMakeLists.txt

@@ -15,18 +15,21 @@ add_library(llama
             llama-chat.cpp
             llama-context.cpp
             llama-grammar.cpp
+            llama-graph.cpp
             llama-hparams.cpp
             llama-impl.cpp
+            llama-io.cpp
             llama-kv-cache.cpp
+            llama-memory.cpp
             llama-mmap.cpp
             llama-model-loader.cpp
             llama-model.cpp
             llama-quant.cpp
             llama-sampling.cpp
             llama-vocab.cpp
-            unicode.h
-            unicode.cpp
             unicode-data.cpp
+            unicode.cpp
+            unicode.h
             )
 
 target_include_directories(llama PUBLIC . ../include ../common)