DATAREDIS-184 - Add support for 'SAVE/NOSAVE' to shutdown.

Created and added `ShutdownOptions` to `RedisServerCommands`. The full implementation is available for `lettuce` and `srp`. 

When using `jedis` the command is emulated using lua script via `eval`.

For `jredis` the method is not available and will throw `UnsupportedOperationException`.