Add patch '19-dump-traceback' to third-party/python/3.14

Summary:
This diff adds a patch to the `third-party/python/3.14` Meta-internal fork.

Export _Py_DumpTraceback

Reviewed By: itamaro

Differential Revision: D95269064

fbshipit-source-id: 92525600ff13f5fc5178d697fa10cd27b809375a

Author: alexmalyshev

Include/internal/pycore_traceback.h

@@ -31,7 +31,7 @@ PyAPI_FUNC(void) _PyTraceback_Add(const char *, const char *, int);
 
    This function is signal safe. */
 
-extern void _Py_DumpTraceback(
+PyAPI_FUNC(void) _Py_DumpTraceback(
     int fd,
     PyThreadState *tstate);