Implement source debugging for interpreter and AOT (#769)

Implement source debugging feature for classic interpreter and AOT:
- use `cmake -DWAMR_BUILD_DEBUG_INTERP=1` to enable interpreter debugging
- use `cmake -DWAMR_BUILD_DEBUG_AOT=1` to enable AOT debugging

See doc/source_debugging.md for more details.

wamr-compiler/main.c

@@ -248,6 +248,12 @@ main(int argc, char *argv[])
     goto fail3;
   }
 
+#if WASM_ENABLE_DEBUG_AOT != 0
+  if (!create_dwarf_extractor(comp_data, wasm_file_name)) {
+    printf("%s:create dwarf extractor failed\n", wasm_file_name);
+  }
+#endif
+
   bh_print_time("Begin to create compile context");
 
   if (!(comp_ctx = aot_create_comp_context(comp_data,