Implement part of Berkeley Socket API for libc-wasi (#1036)

Refer to [Networking API design](https://github.com/WebAssembly/WASI/issues/370)
and [feat(socket): berkeley socket API v2](https://github.com/WebAssembly/WASI/pull/459):

- Support the socket API of synchronous mode, including `socket/bind/listen/accept/send/recv/close/shutdown`,
    the asynchronous mode isn't supported yet.
- Support adding `--addr-pool=<pool1,pool2,..>` argument for command line to identify the valid ip address range
- Add socket-api sample and update the document

core/iwasm/interpreter/wasm_runtime.c

@@ -1522,6 +1522,7 @@ wasm_instantiate(WASMModule *module, bool is_sub_inst, uint32 stack_size,
                 module->wasi_args.dir_list, module->wasi_args.dir_count,
                 module->wasi_args.map_dir_list, module->wasi_args.map_dir_count,
                 module->wasi_args.env, module->wasi_args.env_count,
+                module->wasi_args.addr_pool, module->wasi_args.addr_count,
                 module->wasi_args.argv, module->wasi_args.argc,
                 module->wasi_args.stdio[0], module->wasi_args.stdio[1],
                 module->wasi_args.stdio[2], error_buf, error_buf_size)) {