Enable source debugging feature for windows platform (#910)

- use platform independent data types in debug-engine library
- add os_socket APIs and provide windows and posix implementation
- avoid using platform related header files in non-platform layer
- use format specifiers macros for sprintf and sscanf
- change thread handle type from uint64 to korp_tid
- add lock when sending socket packet to avoid thread racing

core/iwasm/libraries/debug-engine/handler.h

@@ -8,6 +8,12 @@
 
 #include "gdbserver.h"
 
+int
+wasm_debug_handler_init();
+
+void
+wasm_debug_handler_deinit();
+
 void
 handle_generay_set(WASMGDBServer *server, char *payload);