> (you don't have to strictly follow this form)

**Use case**

Support manually snapshot for Keeper.

**Describe the solution you'd like**

Throught 4lw commands, such as `csnp`.


#pragma once
#include <Coordination/CoordinationSettings.h>
#include <Coordination/InMemoryLogStore.h>
#include <Coordination/KeeperStateMachine.h>
#include <Coordination/KeeperStateManager.h>
#include <Coordination/KeeperStorage.h>
#include <libnuraft/raft_params.hxx>
#include <libnuraft/raft_server.hxx>
#include <Poco/Util/AbstractConfiguration.h>
#include <Coordination/Keeper4LWInfo.h>
#include <Coordination/KeeperContext.h>
namespace DB
{
using RaftAppendResult = nuraft::ptr<nuraft::cmd_result<nuraft::ptr<nuraft::buffer>>>;
class KeeperServer