Remove SimpleResultHandler
There is really no need for a result handler dedicated to a void return value and it's actually problematic to have it. Each result handler treats void as necessary. For an @ResponseBody method it means an empty body. For view resolution it means no specific value was returned and we should procede with selecting a default view name. Having a dedicated void result handler can interfere with this especially since view resolution needs to be last in order. At the same time there are cases when no result handling is needed and the response is fully handled within the HandlerAdapter. This is the case with WebHandler and the SimpleHandlerAdapter. For that case we simply return mono.then(aVoid -> Mono.empty()) which effectively returns an empty Mono and no result handling follows. The HandlerAdapter already says you can return no values at all if the response is fully handled.
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