llama : second attempt to refactor vision API

src/llama-context.h

@@ -6,6 +6,7 @@
 #include "llama-model.h"
 #include "llama-kv-cache.h"
 #include "llama-adapter.h"
+#include "llama-vision.h"
 
 #include "ggml-cpp.h"
 
@@ -107,6 +108,9 @@ struct llama_context {
     struct ggml_tensor * inp_pos_bucket;    // I32 [n_batch|n_kv, n_batch]
     struct ggml_tensor * inp_embd_enc;      // F32 [n_embd, n_outputs_enc]
     struct ggml_tensor * inp_KQ_mask_cross; // F32 [n_outputs_enc, n_batch]
+
+    // vision
+    clip_context vctx;
 };
 
 // TODO: make these methods of llama_context