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.

core/iwasm/aot/debug/elf_parser.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2021 Ant Group.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _ELF_PARSERE_H_
+#define _ELF_PARSER_H_
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool
+is_ELF(void *buf);
+
+bool
+is_ELF64(void *buf);
+
+bool
+get_text_section(void *buf, uint64_t *offset, uint64_t *size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif