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/jit_debug.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2021 Ant Group.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _JIT_DEBUG_H_
+#define _JIT_DEBUG_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool
+jit_debug_engine_init();
+
+void
+jit_debug_engine_destroy();
+
+bool
+jit_code_entry_create(const uint8 *symfile_addr, uint64 symfile_size);
+
+void
+jit_code_entry_destroy(const uint8 *symfile_addr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif