A few improvements and simplifications can be done in Vert.x Context

• remove the internal ContextTask functional interface (which is a Runnable that can throw) as we can use Handler<Void> in practice which unified the internal Context#wrapTask method
• remove the internal Action functional interface (which is similar to a Callable) as we can use the Handler<Future<T>> idiom instead
• add a ContextInternal#executeFromIO(T,Handler<T>) so an handler task can be passed an argument
• decompose the implementation of ContextImpl#wrapTask so the logic can be reused by executeFromIO without creating a unnecessary lambda
• handle the worker task metric in WorkerContext instead of ContextImpl#wrapTask
• avoid unnecessary lambda captures in VertxHandler when handling a message from Netty