Fix memory sharing (#2415)

- Inherit shared memory from the parent instance, instead of
  trying to look it up by the underlying module. The old method
  works correctly only when every cluster uses different module.
- Use reference count in WASMMemoryInstance/AOTMemoryInstance
  to mark whether the memory is shared or not
- Retire WASMSharedMemNode
- For atomic opcode implementations in the interpreters, use
  a global lock for now
- Update the internal API users
  (wasi-threads, lib-pthread, wasm_runtime_spawn_thread)

Fixes https://github.com/bytecodealliance/wasm-micro-runtime/issues/1962

core/iwasm/common/wasm_runtime_common.h

@@ -498,7 +498,8 @@ wasm_runtime_unload(WASMModuleCommon *module);
 
 /* Internal API */
 WASMModuleInstanceCommon *
-wasm_runtime_instantiate_internal(WASMModuleCommon *module, bool is_sub_inst,
+wasm_runtime_instantiate_internal(WASMModuleCommon *module,
+                                  WASMModuleInstanceCommon *parent,
                                   WASMExecEnv *exec_env_main, uint32 stack_size,
                                   uint32 heap_size, char *error_buf,
                                   uint32 error_buf_size);