Restore clip's cb() to its rightful glory - extract common debugging elements in llama (#17914)

* Extract common debugging functions; plug eval-callback and mtmd's MTMD_DEBUG_GRAPH with same functionality

* Move to common

* Remove unneeded header

* Unlink from common

* chore: update webui build output

* Cleanup; properly pass params to mtmd without depending on common; factorize debug.cpp to use common debug code.

* Revert change to webapp

* Post-merge adjust

* Apply suggestions from code review

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

* Apply code review changes

* Remove changes to server-context

* Remove mtmd.h include

* Remove utility functions from header

* Apply suggestions from code review

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

* Rename functions

* Update tools/mtmd/clip.cpp

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

* Update tools/mtmd/clip.cpp

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

* Update tools/mtmd/clip.cpp

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

---------

Co-authored-by: Xuan-Son Nguyen <thichthat@gmail.com>

tools/mtmd/clip.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "ggml.h"
+#include "mtmd.h"
 
 #include <stddef.h>
 #include <stdint.h>
@@ -37,6 +38,8 @@ struct clip_context_params {
     int image_min_tokens;
     int image_max_tokens;
     bool warmup;
+    ggml_backend_sched_eval_callback cb_eval;
+    void * cb_eval_user_data;
 };
 
 struct clip_init_result {