fit-params : refactor + add option to output estimated memory per device (#22171)

* fit-params : add option to output estimated memory per device

* cont : minor

* cont : refactor

* cont : move fit params implementation to libcommon

* cont : header

* cont : headers

* cont : codeowners

tools/perplexity/perplexity.cpp

@@ -1,5 +1,6 @@
 #include "arg.h"
 #include "common.h"
+#include "fit.h"
 #include "log.h"
 #include "llama.h"
 
@@ -2087,7 +2088,7 @@ int main(int argc, char ** argv) {
 
     LOG("\n");
     llama_perf_context_print(ctx);
-    llama_memory_breakdown_print(ctx);
+    common_memory_breakdown_print(ctx);
 
     llama_backend_free();