Format memory warning in human-friendly way.

PiperOrigin-RevId: 486610408
Change-Id: I6beecb12059e69f4407e921d20efc54ce6b3f491

src/engine/engine_util_misc.h

@@ -87,6 +87,9 @@ MJAPI const char* mju_type2Str(int type);
 // convert type name to type id (mjtObj)
 MJAPI int mju_str2Type(const char* str);
 
+// return human readable number of bytes using standard letter suffix
+MJAPI const char* mju_writeNumBytes(const size_t nbytes);
+
 // warning text
 MJAPI const char* mju_warningText(int warning, size_t info);