common: fix missing exports in llama-common (#22340)

* common: refactor common/debug to move abort_on_nan into base_callback_data

Passing bool abort_on_nan as template parameter for common_debug_cb_eval is unnecessary and creates an issue with LTO.
It should just be a member of the base_callback_data instead.

* cont : cleanup

* common : use pimpl in debug.h to reduce header dependencies

Move common_debug_cb_user_data's data members (std::regex,
std::vector<uint8_t>) into a private impl struct in debug.cpp.

This removes the includes of common.h and <regex> from debug.h,
reducing transitive dependencies for any translation unit that
includes the header.

Assisted-by: llama.cpp:local pi

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

tools/mtmd/debug/mtmd-debug.cpp

@@ -72,7 +72,7 @@ int main(int argc, char ** argv) {
 
     mtmd::context_ptr ctx_mtmd;
     common_init_result_ptr llama_init;
-    base_callback_data cb_data;
+    common_debug_cb_user_data cb_data;
 
     llama_init = common_init_from_params(params);
     {
@@ -89,7 +89,7 @@ int main(int argc, char ** argv) {
         {
             // always enable debug callback
             mparams.cb_eval_user_data = &cb_data;
-            mparams.cb_eval = common_debug_cb_eval<false>;
+            mparams.cb_eval = common_debug_cb_eval;
         }
         ctx_mtmd.reset(mtmd_init_from_file(clip_path, model, mparams));
         if (!ctx_mtmd.get()) {