Possibility to configure LoopResources inside ReactorNettyClient

[MaksimOrlov]

Hi.

For now method public static Mono<ReactorNettyClient> connect in ReactorNettyClient class doesn't allow to manually configure workerCount and selectCount parameters for LoopResources. It uses default Netty configaration. Also it will be more convenient to manually set prefixes for R2DBC workers thread pool.

So, the suggestion is to add LoopResources parameter alongside ConnectionProvider.